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Filling of Electrons for Elements

Which one of ...

Question

Which one of the following electronic configurations depict an oxygen atom?

1s²2s²2p²3s²

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1s²2s²2p¹

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1s²2s²2p⁴

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1s²2s²2p²

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Solution

The correct option is C
1s²2s²2p⁴

This is as per the various rules for filling of electrons in various orbitals i.e. Hund's rule of maximum multiplicity, Aufbau principle and Pauli Exclusion Principle.

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