An object moving with a speed of 24 m/s has a kinetic energy of 356 J, what is the mass of the object.​

Selenium is a chemical element with the atomic number 34 and the symbol Se. It is a nonmetal with properties that are intermediate between sulphur and tellurium in the periodic table, as well as similarities to arsenic.

a) The isotopes have the same number (34) of protons, but a different number of neutrons.

b) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^4 is the complete electron configuration for a selenium atom.

c) Se' 1st ionization energy is greater than Te because Se is experiencing less shielding than Te, as a result Se' electrons are more attracted to the nucleus compared to Te.

d) Seesaw shape is the shape of the selenium tetrafluoride and the number of electrons is 34. It is polar due to Asymmetry.

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Buffer solution containing equimolar amounts of PO₄³⁻ and HPO₄²⁻ then

a) PO₄³⁻ + H3O⁺ = HPO₄²⁻ + H₂O

b) HPO₄²⁻ + OH⁻ = PO₄³⁻ + H₂O

A) Add mg to each solution, then watch for gas bubbles to emerge. B) Change the temperature of each solution by adding aqueous sodium hydroxide. C) To determine how bright the light glows, use all solution in an electric circuit containing a battery and a lamp. D) Try the remedies.

Equimolar remedies Equimolar solution are those in which each mole of a solvent is saturated in the same amount of solvent. As a result, all the colliding characteristics also remains the same in a molar ratio solution since both solvents have the same quantity or number of moles.

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The complete question is-

Write an equation to show what happened when, to a buffer solution containing equimolar amounts of PO₄³⁻ and HPO₄²⁻, we add.

a) H3O⁺

_____ + _____ ----> _____ + _____

b) OH⁻

_____ + _____ ----> _____+ _____

please do the math

To solve this problem, we need to use the balanced chemical equation given in the question to determine the relative amounts of the reactants and products. The balanced chemical equation is:Cr2O3 + 2Al → 2Cr + Al2O3We are given that the starting amount is 1 tonne of chromium (III) oxide (Cr2O3), and we want to calculate the mass of aluminium needed to react with this amount. From the balanced equation, we can see that for every 1 mole of Cr2O3 that reacts, 2 moles of Al are needed.1 tonne is equal to 1000 kg, and the molar mass of Cr2O3 is 151.99 g/mol, so 1 tonne of Cr2O3 is equal to 1000 / 151.99 = 6.58 moles of Cr2O3. Since 2 moles of Al are needed for every 1 mole of Cr2O3, 6.58 moles of Al are needed to react with 1 tonne of Cr2O3.The molar mass of Al is 26.98 g/mol, so 6.58 moles of Al is equal to 6.58 x 26.98 = 179 kg of Al. Therefore, the mass of aluminium needed to react with 1 tonne of chromium (III) oxide is 179 kg.To calculate the mass of chromium produced, we can use the same method. From the balanced equation, we can see that for every 1 mole of Cr2O3 that reacts, 2 moles of Cr are produced. Since 1 tonne of Cr2O3 is equal to 6.58 moles, 6.58 x 2 = 13.16 moles of Cr are produced.The molar mass of Cr is 52 g/mol, so 13.16 moles of Cr is equal to 13.16 x 52 = 687 kg of Cr. Therefore, the mass of chromium produced from 1 tonne of chromium (III) oxide is 687 kg.

The balanced chemical equation provided in the question must be used to calculate the proportions of the reactants and products in order to answer this issue. Al2O3 + Cr2O3 = Cr2O3 + Al2O3 is the balanced chemical equation.

Given a starting amount of 1 tonne of chromium (III) oxide (Cr2O3) and need to determine how much aluminum is required for the reaction to occur.

We can see from the balanced equation that 2 moles of Al are required for every 1 mole of Cr2O3 that reacts. Given that 1 tonne is equivalent to 1000 kg and that Cr2O3 has a molar mass of 151.99 g/mol, 1 tonne of Cr2O3 is equal to 6.58 moles of Cr2O3.

In order for 1 tonne of Cr2O3 to react with 6.58 moles of Al, 2 moles of Al must be added for every mole of Cr2O3.6.58 moles of Al are equivalent to 6.58 x 26.98, or 179 kg, of Al since the molar mass of aluminum is 26.98 g/mol.

As a result, 179 kg of aluminum is required to react with 1 tonne of chromium (III) oxide.

We may apply the same procedure to determine the mass of chromium produced. The balanced equation shows that 2 moles of Cr are created for every mole of Cr2O3 that reacts.

Because 1 tonne of Cr2O3 is equivalent to 6.58 moles, the amount of Cr produced is 6.58 x 2 = 13.16 moles.

13.16 moles of Cr are equal to 13.16 x 52 = 687 kg of Cr since the molar mass of Cr is 52 g/mol. Consequently, 687 kg of chromium is created from 1 tonne of chromium (III) oxide.

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Green light has a higher frequency and shorter wavelengths than infrared radiation. Option A is correct.

On the electromagnetic spectrum, green light, which is visible light, has a wavelength that falls between 380 nm and 750 nm, while infrared light, which begins at 700 nm and extends to 1 mm, is just beyond it. Because of this, infrared can only be viewed with specialised tools like security cameras.

Due to their longer wavelengths than visible light, infrared waves can travel across crowded areas of gas and dust in space without being significantly scattered or absorbed. In comparison to infrared photons, visible light has shorter wavelengths and higher frequency.

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Answer:

help what is this im so sorry u have to do this

Explanation:

omg

An atomic nucleus, atom, or molecule's ground state is its lowest energy state. Excited states are referred to as higher energy states. Any particle property that has been quantized falls under the ground state.

Atomic ground states and Ground states of vibration, Rotational ground conditions of atoms and molecules, as well as their excited states, are significant.

Most molecules are in their electron and vibrational ground states at ambient temperature; they must be heated to enter excited states.

Since a molecule requires less energy to enter a rotational excited state than an electron or vibrational excited state, the majority of molecules are in an excited rotational state at room temperature.

Therefore, An atomic nucleus, atom, or molecule's ground state is its lowest energy state. Excited states are referred to as higher energy states. Any particle property that has been quantized falls under the ground state.

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In a molecule with the formula AB2, the hybridization of the central atom is typically sp hybridization. This type of hybridization allows for the formation of two single bonds in opposite directions, which gives the molecule its linear molecular geometry.

A molecule with the formula AB2, such as carbon dioxide (CO2), is an example of a linear molecular geometry. In this type of molecule, the central atom is bonded to two other atoms, forming a straight line. The hybridization of the central atom, which is the process of mixing different types of atomic orbitals to form new hybrid orbitals, is determined by the number and types of bonds formed with the atoms around it.

In a molecule with the formula AB2, the hybridization of the central atom is typically sp hybridization. This is because there are two single bonds formed with two different atoms, which would require the combination of one s orbital and one p orbital. The s orbital is used to form the sigma bond between the central atom and the two other atoms, while the p orbital is used to form the two pi bonds.

The sp hybridization of the central atom also allows the molecule to have a linear molecular geometry. This is because the two single bonds formed by the sp hybrid orbitals are in opposite directions and create a straight line, giving the molecule its linear shape.

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One of the most widely used explosophores—functional groups that give a compound its explosive properties—in the world is the nitro group. Also strongly electron-withdrawing is the nitro group. This property allows for the possibility of acidic C-H bonds that are alpha to the nitro group (nearby).

The silver-mirror appearance that develops at the end of the reaction serves as a marker for the Nitro group. Tollen's reagent is used to heat hydroxylamine even more. Heating causes hydroxylamine to oxidize into the appropriate nitroso compound and reduce Tollen's reagent to metallic silver.

The prefix "nitro" is added to the name of the matching alkane or arene to create the name of any nitro compound.

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question:-

What type of group is nitro group?

Answer:

The specific heat capacity of the metal is 0.529 J/g · C.

Explanation:

To calculate the specific heat capacity of a metal, you can use the following formula:

c = Q / (m * ΔT)

Where c is the specific heat capacity of the metal, Q is the amount of heat required to change the temperature of the metal, m is the mass of the metal sample, and ΔT is the change in temperature.

In your case, the amount of heat required to change the temperature of the metal is 481 J, the mass of the metal sample is 17.0 g, and the change in temperature is 67°C - 25°C = 42°C. Plugging these values into the formula, we get:

c = 481 J / (17.0 g * 42°C) = 0.529 J/g · C

Therefore, the specific heat capacity of the metal is 0.529 J/g · C.

The specific heat capacity can be calculated using the calorimetric equation. The specific heat capacity of the metal is calculated to be 0.67 J/ °C g.

The specific heat capacity of a substance is the heat energy required to rise its temperature by one degree celsius per one gram of the substance. It is an intensive property.

The calorimetric equation connecting the heat energy q to mass m, temperature difference ΔT and specific heat c is given below:

q = m c ΔT

Given mass = 17 g

heat energy q = 481 J

temperature difference = 67 - 25 = 42° C

Then c = 481 / (17 g × 42° C ) =  0.67 J/ °C g.

Therefore, the specific heat of the metal is  0.67 J/ °C g.

.

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Since non-metals (-ve ion) are "stronger" than metals (+ve ion), they may easily obtain electrons from metals. Ionic bonds are created when these two opposing ions are drawn to one another.

The term "metal" refers to any one of a group of materials with high thermal and electrical conductivities, as well as malleability, ductility, and high light reflection.

During the hippy era, when "heavy" indicated serious or profound, the term "metal" is thought to have originated. A few essential elements make up metal music: forceful drumming, extra-low bass notes, and angry or throaty vocals. The guitar riffs and chords are sometimes greatly distorted.

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The electron transition from n = 4 to n = 1 emits radiation of the shortest wavelength in a hydrogen atom.

Energy is either released or absorbed as an electron moves from one shell to another. The formula for calculating the wavelength produced by electron transfer is as follows:

1/λ = R ([tex]\frac{1}{n_{1} ^{2} } - \frac{1}{n_{2} ^{2} }[/tex])

where,

λ = wavelength of the photon (wavenumber = 1/wavelength)

R = Rydberg's constant (1.0973731568539(55) x 107 m-1)

[tex]n_{1}[/tex] and [tex]n_{2}[/tex] are integers where [tex]n_{2}[/tex] > [tex]n_{1}[/tex]

Therefore, on putting the respective values of [tex]n_{1}[/tex] and [tex]n_{2}[/tex], we can find out that the transition of electron from n = 4 to n = 1 radiates the shortest wavelength in a hydrogen atom.

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Magnesium parts are typically attached using mechanical fasteners.

A tool used to mechanically attach (or fasten) two or more things together is known as a mechanical fastener. Although there are many distinct kinds of mechanical fasteners, they can generally be split into two groups: permanent and non-permanent fastening.

There are many different kinds of mechanical fasteners, such as screws, nails, nuts, bolts, washers, anchors, and rivets.

Since World War II, magnesium sheet has been utilized in the transportation sector as a structural material.

For the purpose of attaching magnesium components to various metal substrates, upset protrusion joining was created. Cast and wrought alloys are the two primary divisions of magnesium alloys. Cast alloys made of magnesium are the most common use. Many industries use parts and components made of magnesium and magnesium alloys.

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To calculate the unified atomic mass unit (u) of 13N using the energy of the reaction given in equation (5.28), you can use the following equation:

u = energy / c^2

where energy is the energy of the reaction in joules, c is the speed of light in meters per second, and u is the unified atomic mass unit in kilograms.

First, you need to convert the energy of the reaction from MeV (Mega electron volts) to joules. You can do this using the conversion factor of 1 MeV = 1.602 x 10^-13 joules. Plugging in the values for the energy of the reaction (-3.00 MeV) and the conversion factor, you get:

Energy in joules = -3.00 MeV * 1.602 x 10^-13 joules/MeV = -4.806 x 10^-13 joules

Next, you need to convert the speed of light from meters per second to joules per second. You can do this using the conversion factor of 1 m/s = 1 j/s. Plugging in the value for the speed of light (299,792,458 m/s) and the conversion factor, you get:

c = 299,792,458 m/s * 1 j/s = 299,792,458 j/s

Now you can plug in the values for energy and c into the equation above to calculate the unified atomic mass unit of 13N:

u = (-4.806 x 10^-13 joules) / (299,792,458 j/s)^2 = 1.50 x 10^-27 kilograms

This is the unified atomic mass unit of 13N in kilograms. You can convert this value to atomic mass units (amu) by dividing it by 1.660 x 10^-27 kilograms/amu:

u in amu = 1.50 x 10^-27 kilograms / (1.660 x 10^-27 kilograms/amu) = 0.906 amu

Therefore, the unified atomic mass unit (u) of 13N is approximately 0.906 amu.

1. Porphyrin[ formal charge=0, found in haemoglobin also  found in cytochrome p-450.

2. Corrin [formal charge=0,found in vitaminB12]

3. Chlorin[formal charge =0,found in chlorophyll as Mg2+chlorin]

What is protein?

Proteins are substantial, intricate molecules that are essential to numerous bodily processes. They perform the majority of their work within cells and are necessary for the development, maintenance, and control of the body's tissues and organs.

For structures please refer attached file

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Cytochrome p-450 and hemoglobin both include porphyrin; Vitamin B12 contains corrin; Chlorophyll contains chlorin.

Neutral molecules: What are they?

A neutral molecule is one that has an equal number of protons and electrons, which prevents it from having a positive or negative electrical charge.

When an atom has an equal amount of protons and electrons, it also has an equal number of positive and negative electric charges . The atom is referred to as neutral since its overall electric charge is zero.

Structure in attachment

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Answer:

B. Experiments are rarely accurate, so it’s important to keep testing a hypothesis.

Explanation:

Answer:

Explanation:

To calculate the volume of Oxygen gas that would be required to produce a given amount of Fe2O3, we need to use the balanced chemical equation for the corrosion (rusting) of iron. The equation is:

3 O2 (g) + 4 Fe (s) —> 2 Fe,O3 (s)

This equation tells us that for every 3 molecules of Oxygen gas that react with 4 molecules of Iron, 2 molecules of Iron (III) oxide (Fe2O3) are produced. Since the atomic weight of Oxygen is 16.0 g/mol and the atomic weight of Iron is 56.0 g/mol, the molar ratio of Oxygen to Iron in the equation is 3/16 = 0.1875.

We can use this molar ratio to calculate the volume of Oxygen gas that would be required to produce a given amount of Fe2O3. To do this, we first need to convert the mass of Fe2O3 to moles. Since the atomic weight of Fe2O3 is 159.7 g/mol, 32.0 g of Fe2O3 is equivalent to 32.0 / 159.7 = 0.201 moles of Fe2O3.

We can then use the molar ratio of Oxygen to Iron to calculate the number of moles of Oxygen gas that would be required to produce 0.201 moles of Fe2O3. Since the molar ratio of Oxygen to Iron is 0.1875, 0.201 moles of Fe2O3 would require 0.201 * 0.1875 = 0.0376 moles of Oxygen gas.

Finally, we can use the molar volume of a gas at standard temperature and pressure (STP) to convert the number of moles of Oxygen gas to volume. At STP, one mole of a gas occupies a volume of 22.4 liters, so 0.0376 moles of Oxygen gas would occupy a volume of 0.0376 * 22.4 = 0

Geh lang

In order to create a crystalline lattice of alternate cations and anions from the blank ions, lattice energy is required.

The lattice energy increases with increasing ion charge. The implication of this is that ions with higher charge values will result in ionic compounds with higher lattice energies. The lattice energies of the compounds that include ions with lesser charges are thus reduced.

Ionic radii and lattice energy are inversely related. The gap between the positive and negative charges widens as ionic radii rise. As a result, the potential energy is less negative. Lattice energy thus declines.

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question:-

What is lattice energy?

In first reaction alkyne is treated with base to remove proton later alkyne anion react with T20 to form tritium isotope labelled product.

What is reagent?

Reagent is a substance used to bring about a chemical reaction, or added to test if a reaction occurs. In a chemical reaction, one or more reactants are combined to form one or more products. A reagent is typically used to start, speed up, or determine the progress of a reaction. Common reagents include acids, bases, oxidizers, reducing agents, and salts. Reagents can also be used in qualitative or quantitative analysis to detect, measure, or separate chemicals in a sample.

For structure refer attached file
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After being treated with a base in the initial reaction to remove the proton, the alkyne anion then reacts with T20 to produce a product labeled with the tritium isotope.

A reagent in a chemical process is what?

In the field of chemical research, a "substance or compound that is given to a system in order to bring about a chemical reaction or is added to check whether a reaction is occurring or not" is referred to as a reagent. A similar response is utilized to validate the discovery of the presence of another drug.

A catalyst can speed up a certain chemical reaction, whereas a reagent is a material or mixture used in chemical analysis or other reactions.

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Answer:

A

Explanation:

Aluminum has only one oxidation state, +3, so no need to specify its oxidation state (III) in its name. Also, ionic compound--between metals and non-metals--do not need a mono, di, or tri added to the beginning of each element's name.

a) The more basic solution is NaOH

b) The reason for this is that NaOH is a strong bas and dissociates completely in solution.

We know that the pH has to do with the degree of  acidity or alkalinity of the solution. The more the pH of the solution the more basic the solution is. The lesser the pH of the solution, the more acidic the solution is.

Drawing form the explanation above, the solution that is more basic is the sodium hydroxide solution. The sodium hydroxide solution is a strong base so it would ionize completely in solution.

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Answer:

Valence electrons are the outermost electrons of an atom, and the number of valence electrons in a metal can be determined by looking at the element's position on the periodic table. Generally, the columns on the periodic table are arranged in order of increasing valence electrons, except for the transition metals. The element's oxidation state can determine the valence electrons for transition metals.

Explanation:

The equilibrium partial pressure of CO(g) can be maximized by carrying out the reaction at low temperature and low pressure.

According to Le Chatelier's principle, when a dynamic equilibrium is disturbed by an external element, the equilibrium will move in a way that may counteract the effect of the external factor in order to maintain the equilibrium.

The given reaction is-

2CO₂(g)  ⇄  2CO(g) + O₂(g)    (ΔH = -514 kJ)

Now, how does change in pressure and temperature affects the reaction-

Change in pressure:

The equilibrium will move toward the side where there are less moles of gas from the reaction as pressure rises. Additionally, when pressure drops, the equilibrium will move in favor of the side where there are more gas molecules involved in the process.

2.0 moles of gases are on the reactants side (on the left) and 3.0 moles are on the products side (on the right).

Therefore, lowering the pressure will cause the reaction to move to the side where there are more gas molecules (right side, products) and the equilibrium partial pressure of CO(g) can be maximized at low pressure.

Change in temperature:

The sign of H indicates that the reaction is exothermic (negative).

The concentration of the products side will decrease as the temperature drops, so the reaction will be moved to the right to counteract the temperature drop so that the equilibrium partial pressure of CO (g) can be maximized at low temperatures.

Hence the correct answer is low temperature and low pressure.

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Using Benedict's solution, lowering sugars such as glucose, fructose, and maltose produce favorable effects.

A brick-red precipitate that forms as a result of Benedict's reagent's interactions with reducing sugars is a sign that the test is successful.

Indophenol Test in Vitamin C and the Benedict Test of Reducing and Non-Reducing Sugars.An illustration of the protein biuret test.Positive evidence that proteins is present is a color change from blue to purple.

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succinate dehydrogenase, malate dehydrogenase, fumarase, and succinyl CoA synthetase. As a cofactor, it uses NAD+ or NADP+ to catalyze the interconversion of malate and oxaloacetate.

The process of creating glucose from smaller molecules, known as gluconeogenesis, also involves malate dehydrogenase. Oxaloacetate, a citric cycle intermediate, is created in the mitochondria by the action of pyruvate carboxylase on pyruvate.

In addition to being a TCA cycle intermediary, malate is a key component of mitochondrial energy homeostasis and the source of carbon skeletons transferred from mitochondria to promote amino acid production.

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Answer:

Jupiter is 5.2 astronomical units from the Sun, at a distance of 484 million miles (778 million kilometres) on average. The distance between the Sun and Earth is one astronomical unit, or AU. Sunlight travels from the Sun to Jupiter at this distance in 43 minutes.

Explanation:

Astronomical unit (AU, or au), a measurement of length that is equivalent to 149,597,870.7 km of the mean or average distance between Earth and the Sun (92,955,807.3 miles).

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2.6×10³Seconds is the time taken by the light to cover the distance from sun to Jupiter.

Time= distance ÷speed

Time=?

Distance= 778,000 000 kilometre

Speed of light is= 3×10⁸

Converting the 778,000 000 kilometre into metre

Since we know that 1 kilometre = 1000 meter

So we will multiply 1000 to the given value 778,000 000 kilometre

So the answered will be,

= 778,000 000,000 meter

Now we can write this value as,

= 778 × 10⁹ meter

Also, = 7.78 × 10¹¹  meter

Now we are putting the values into the above formula that is,

Time= 7.78 × 10¹¹ ÷ 3×10⁸

Time= 2.6 × 10³ Seconds

Jupiter:  Jupiter is the fifth planet from the Sun and is the biggest planet in the Solar System. It is a gas giant with a mass just below one thousandth that of the Sun but greater than 2.5 times that of all the other planets combined in the Solar System.

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The given statement is correct. What atom we are looking at is determined by the number of protons.

The atomic number of an element is equal to the number of protons in an atom. Use oxygen as an example. The periodic table states that oxygen has an atomic number of eight. The element's symbol is placed above the atomic number.

A neutral atom has the same number of protons and electrons as protons. The total of the protons and neutrons with in atom's nucleus determines its mass, which is denoted by the letter M. The number of neutrons is equivalent to the discrepancy between the atomic number and the mass number of the atom (M) (Z).

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complexes can be classified based on number of unpaired electron as follows square planar strong field: 2 unpaired electrons, octahedral weak field: 4 unpaired electrons, tetrahedral strong field: 2 unpaired electrons, octahedral strong field: 0 unpaired electrons, tetrahedral weak field: 4 unpaired electrons, square planar weak field: 4 unpaired electrons.

In a coordination complex, the number of unpaired electrons in the metal ion depends on the strength of the ligand field and the orientation of the ligands. Strong field ligands have a higher affinity for the d orbitals and can more effectively stabilize them, leading to a lower number of unpaired electrons in the metal ion.

Weak field ligands have a lower affinity for the d orbitals and do not stabilize them as effectively, leading to a higher number of unpaired electrons in the metal ion. The number of unpaired electrons also depends on the orientation of the ligands, with an octahedron (6 ligands) and a tetrahedron (4 ligands) leading to different numbers of unpaired electrons.

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Divide the imbalanced response into two equal halves. - maintain atomic equilibrium for each half-reaction. To balance oxygen, add H2O to each half-reaction that requires it, and to balance hydrogen, add H+ as necessary.

Redox reactions are oxidation-reduction chemical processes in which the oxidation states of the reactants change. Redox is a shortened version of reduction-oxidation. Two distinct techniques may be used to summarize all redox reactions.

Redox reactions are those in which one chemical is reduced and another is oxidized. Here, oxygen is being introduced, which causes C to oxidize into CO, and oxygen is being withdrawn, which causes ZnO to decrease to Zn. It is a redox reaction as a result.

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At Constant temperature, the behavior of a Ideal gas more closely approximates that of an ideal gas as its volume increases due to the average distance between the molecule becomes greater.

According to the Molecular Theory of gases, at constant temperature the behavior of a sample of a real gas more closely approximates that of an ideal gas as its volume is increased because the average distance between molecules becomes greater. The temperature did not change, so the average kinetic energy and average molecular speed did not change. The molecule size does not change either, so the molecule could not have expanded. The distance between the molecules increases causing a decrease in intermolecular forces, thus reducing the interaction between the molecules.

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Only BeCl4^2- has a central atom with sp3 hybridization. The other molecules, SF4 and BrO3-, do not have a central atom with sp3 hybridization.

When it comes to identifying which of the following molecules has a central atom with sp3 hybridization, the answer is X. BeCl4^2-. This molecule has a central atom of beryllium, which has an electron configuration of [He] 2s^2 2p^1. In order to form a stable structure, the beryllium atom must use sp3 hybridization, which is a combination of one s orbital and three p orbitals. This hybridization allows the beryllium atom to form four single covalent bonds with the four chlorine atoms, resulting in a tetrahedral shape.

The other molecules, Y. SF4 and Z. BrO3-, have central atoms of sulfur and bromine, respectively. Both of these atoms have an electron configuration of [Ne] 3s^2 3p^4. This allows them to form a stable structure without needing to use sp3 hybridization. Instead, sulfur forms a seesaw shape using sp3d2 hybridization, while bromine forms a trigonal bipyramidal shape using sp3d2 hybridization.

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The valid electronic configuration among the following is  1s2 2s2 2p6 3s2 3p6 4s2 3d5.

The electronic configuration of shell of an atom is based on certain rules of atomic stability and chemical nature. In the Aufbau principle, the orbitals are filled in accordance with the atoms' increasing energies in their ground state. In Pauli's principle, there can never be two identical sets of four quantum numbers for an atom's electrons. In Hund's rule, Prior to each orbital in that subshell having one electron each, the electrons in the orbitals that belong to the same subshell (p, d, or f) pair.  These rules must be followed while filling electrons in an orbital.

Hence, electron are filled in sub-shell in designated order.

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