Periodic TableHard

Question

Amongst the following elements (whose electronic configurations are given below), the one having the highest ionisation energy is :

Options

A.[Ne]3s23p1
B.[Ne]3s23p3
C.[Ne]3s23p2
D.[Ar]3s104s24p3

Solution

(a) and (c) are not correct as they have incompletely filled p-subshells. (b) and (d) have half filled p-subshell from which e- will be removed in (b) electron will be removed from III shell while in (d) from (IV) shell. Thus (c) [Ne]3s2, 3p2 will have highest I E1.

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