Question

Explain it please and I will mark you as branliest
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Answer 1

Answer:

The first of these rules is known as the Pauli exclusion principle, and it states that no two electrons in an atom can have the exact same quantum numbers. So far, we know that each shell contains multiple subshells and each subshell has at least one orbital that can hold two electrons.Hund's rule, electrons will fall into empty orbitals of the same energy before electrons begin to pair up into the same orbital.

APPLYING HUND'S AND PAULI'S RULE

He

electronic configuration

1s^2( all orbitals of s are filled completely)

N electronic configuration

1s^2,2s^2 ,2p^3

( here p will have its all orbitals half filled in one direction)

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Answer 2

Answer:

Explanation

PAULI ' S PRINCIPLE :

The principle states with two (2) electrons cannot have all the same Quantum numbers .

HUND ' S PRINCIPLE :

The principle states that electrons will first occupy the orbitals singly and then undergo pairing .

Following these principles :

Helium has atomic numer 2 . Hence , these two electrons occupy the 1s orbital in pair .

{He}2 = {⬆️⬇️}

1s2

Nitrogen has atomic number 7 .

{N}7 = (⬆️⬇️) (⬆️⬇️) (⬆️⬆️⬆️)

7s2 2s2 2p3

Hence :

first two electrons occupy the 1st orbital , second to electron occupy the 2s orbital . And last three electron occupy the 2p orbital without pairing ....

OR

HUND ' S RULE states that is 2 or more degenerate (ie. same energy ) orbitals are available , one electron goes into each until all of them are half full before pairing up ........

THE PAULI exclusion Principle states that no two electrons can be identified by the same set of the quantum numbers ...........

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