The electronic configuration of the element with maximum electron affinity is

Options

A. a) `1s^(2),2s^(2),2p^(3)`
B. b)`1s^(2),2s^(2),2p^(5)`
C. c)`1s^(2),2s^(2),2p^(6),3s^(2),3p^(5)`
D. d)`1s^(2),2s^(2),2p^(6),3s^(2),3p^(3)`

Answer

C

Explanation

Generally electron affinity increases in a period and decreases in a group but due to smaller size and high electron density on fluorine atom , it experience high intereltronic repulsions . Thus , `F^(-)` ion is less stable in comparison to `Cl^(-)` ion , Hence , electron affinity is highest for chlorine . Its electronic configuration is `_(17)Cl=1s^(2),2s^(2),2p^(6),3s^(2),3p^(5)`