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The first ionisation potential of Mg , A...

The first ionisation potential of `Mg , Al, P and S` follows the order

A

`Mg lt Al lt P lt S`

B

`Al lt Mg lt P lt S`

C

`Al lt Mg lt S lt P`

D

`Mg lt Al lt S lt P`

Text Solution

Verified by Experts

The correct Answer is:
C
Because of extra stability of exactly half-filled electronic configuration of P its `IE_1` is higher than that of S. Further the `IE_1` of Mg is higher than that of Al because in case of Mg. electron is to be removed from a 3s - orbital while in case of Al, because in case of Mg, electron is to be removed from a 3s-orbital while in case of Al, the electron to be removed from a 3p-orbital. Thus, option (c) . i.e, `Al < Mg < S < P` is correct.
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