1.

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`

Answer» Correct Answer - 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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