Which of the following species having same value of `sigma^(**)` (Screening constant) for 2s electrons?

Options

A. F
B. Na
C. Cl
D. Zn

Answer

BCD

Explanation

`{:(F =1s^(2)2s^(2) 2p^(5),,,sigma^(**)=(7-1)xx0.35+2xx0.85),(Na=1s^(2)2s^(2)2p^(6)3s^(1),,,sigma^(**) =(8-1)xx0.35+2xx0.85),(Cl=1s^(2)2s^(2)2p^(6)3s^(2)3p^(6),,,sigma^(**)=(8-1)xx0.35+2xx0.85),(Zn=1s^(2)2s^(2)2p^(6) 3s^(2)3p^(6) 4s^(2)3d^(10),,,sigma^(**)=(8-1)xx0.35+2xx0.85):}`