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Quantum Numbers

For which of ...

Question

For which of the following elements, outermost orbit's last electron has azimuthal quantum number l = 0?

A

Na

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B

O

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C

Cl

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D

N

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Solution

The correct option is D Na
Na i.e. in sodium outermost orbit's last electron has azimuthal quantum number l = 0.
Na belongs to 3rd period and hence n should be 3 for the valence electron of this element.

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