Which set is expected to show the smalle...

Which set is expected to show the smallest difference in `IE_(1)` ?

A

He, Ne, Ar

B

`Mg, Mg^(+), Mg^(2+)`

C

B, N, O

D

Fe, Co, Ni

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The correct Answer is:

D

Fe, Co, Ni are transition metal atoms and variation in properties of such elements (d-block elements) is quite less (as they have nearly same size.)

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