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Quantum Numbers

What is the p...

Question

What is the principal quantum number for the last electron that is added to potassium?

A

1

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B

2

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C

3

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D

5

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E

4

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Solution

The correct option is E 4
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$ this is the electronic configuration of the $K$ .
4 is the principal quantum number for the last electron that is added to potassium.

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