1.

The correct order in which the first ionisation potential increases is

Answer»

K, Be, Na
Be, Na, K
Na, K, Be
K, Na, Be

Solution :The ELECTRONIC configuration of the elements are
`._(4)Be-1s^(2)2s^(2)`
`._(11)Na-1s^(2)2s^(2)2p^(6)3s^(1)`
`._(19)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 `I^(st)` 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 `KltNaltBe`.


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