JEE Main Chemistry question

The decreasing order of the second ionization energy of K, Ca and Ba is:

(A)Correct
(B)
(C)
(D)

Answer: (A)

Solution

Removing the second electron from means breaking into K's stable, noble-gas-like core configuration — an abnormally high-energy process. In contrast, and each still have one genuine valence electron (configuration $[\text{noble

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Question ID VK-133667