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The correct order in which the first ion...

The correct order in which the first ionisation potential increases is

A

K, Be, Na

B

Be, Na, K

C

Na, K, Be

D

K, Na, Be

Text Solution

Verified by Experts

The correct Answer is:
D
The electronic configuration of the elements are
`""_4Be - 1s^2 2s^2`
`""_11 Na - 1s^2 2s^2 2p^6 3s^1`
`""_K - 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1`
The first ionisation energy of Be is maximum because electron is to be drawn from stable (fully filled) orbital. The Ist ionisation energy of Na is greater than K because size of the K is bigger than Na which facilitates easy removal of electron from its outermost shell.
So, the sequence is K < Na < Be.
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