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The electronic configuration of elements...

The electronic configuration of elements A, B, and C are `[He] 2s^(1)`, `[Ne]3s^(1)` and `[Ar] 4s^(1)` respectively. Which one of the following order is correct for the first ionisation potentials (in `KJ mol^(-1)`) of A, B and C?

A

`A gt B gt C`

B

`C gt B gt A`

C

`B gt C gt A`

D

`C gt A gt B`

Text Solution

Verified by Experts

The correct Answer is:
A
Because Atomic size `prop (1)/("Ionisation potential")`
Ionisation potential of element decreases by increasing its atomic size and also decreases with the case of removal of electron. Hence, the order of ionisation potential is A>B>C.
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