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Q.

Amongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is

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a

[Ne]3s23p1

b

[Ne]3s23p3

c

[Ne]3s23p2

d

[Ar]3d104s24p3

answer is B.

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Detailed Solution

It has half filled electronic configuration and needs more energy. In option 4 also we can see half filled, but it has large size.
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