1.

The correct order in which the first ionization 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 IONIZATION energy of Be is maximum because electron is to be drawn from stable (fully filled) orbital. The `1^(st)`ionization 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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