Explain electronic configuration of helium and nitrogen according to Pauli and hund's principle
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Answer: Hund's Principle:
This principle states that electrons will first occupy the orbitals singly and then undergo pairing
Helium has an atomic number 2. Hence these two electrons occupy the 1s orbital in pair.
Nitrogen has an atomic number 7. Hence , the first two electrons occupy the 1s orbital, second to electron occupy the 2s orbital. And the last three electron occupy the 2p orbital without pairing.
Explanation:
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