Question

EXPLAIN ELECTRONIC CONFIGURATION OF He AND N ACCORDING TO PAULI'S AND HUND'S PRINCIPLE

Answer 1

ANSWER

Pauli's Principle:

This principle states that two electrons cannot have all the same Quantum numbers.

Hund's Principle:

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

Following these principles:

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

Nitrogen has atomic number 7.

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

Hope It Helps.

Answer 2

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I don't know the question is from which book

The questions are given by my physics teacher as assignment