JEE Main 2019 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2019

The element having greatest difference between its first and second ionization energies, is:

(A)Ca
(B)Sc
(C)KCorrect
(D)Ba

Answer: (C)

Solution

For K the second electron comes from the noble-gas core.

Question ID VK-009432