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The electronic configuration of element ...

The electronic configuration of element `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 `IE_(1) ("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 Agt B`

Text Solution

Verified by Experts

The correct Answer is:
A
All these elements are the succeeding members of a group in the periodic table. As we move down the group, the ionization enegry decreases on account of the increase in the number of shells.
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