How many electron in K (Z =19) have n = ...

How many electron in K (Z =19) have n = 4, l = 0 ?

A

1

B

2

C

3

D

4

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The correct Answer is:

A

K has configutation `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(0) 4s^(1)`. N = 4, l = 0 refers to 4s-orbital having only 1 electron.

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