Which of the following represents correct order of increasing first ionization enthalpy for Ca, Ba, S, Se, and Ar?

Options

A. `S lt Se lt Ca lt Ba lt Ar`
B. `Ba lt Ca lt Se lt S lt Ar`
C. `Ca lt Ba lt S lt Se lt Ar`
D. `Ca lt S lt Ba lt Se lt Ar`

Answer

B

Explanation

`IE_(1)` increases along the period and decreases sown the group. Moreover Ar is inert gas, has completely filled `bar(e)`'s (Stable structure) hence highest `IE_(1)`.
`underset(((18 gp, 3rd period)))(Ar) gt underset
(((16 gp, 3rd period)))(S) gt underset
(((16 gp, 4th period)))(Se) gt underset
(((2nd gp, 4th period)))(Ca) gt underset(((2nd gp, 6th period)))(Ba)`