The successive ionisation energies of an atom show a sudden large jump between IE_4 and IE_5. The number of valence electrons present in the atom is

JEE Main Chemistry question

The successive ionisation energies of an atom show a sudden large jump between and . The number of valence electrons present in the atom is

(A)4Correct
(B)3
(C)5
(D)2

Answer: (A)

Solution

A sudden disproportionate jump between two successive ionisation energies occurs when the next electron must be removed from a completed, more stable inner shell rather than the valence shell. A jump specifically between

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Question ID VK-133171