The set of quantum numbers n=4 , l=0 m=0 and `s=+1/2` correspond to the most loosely bound , ground state electron of which one of the following atoms

Options

A. Na
B. Cl
C. Cr
D. Rb

Answer

C

Explanation

`""_(11)Nato1s^(2)2s^(2)2p^(6)3s^(1)`
`""_(17)Cl to1s^(2)2s^(2)2p^(6)3s^(2)3p^(5)`
`""_(24)Crto1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`
`""_(37)Rbto1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)5s^(1)`