MHT CET Chemistry question

The alkaline earth metals have smaller size than those of corresponding alkali metals. This is due to

(A)increase in ionisation enthalpy
(B)decrease in nuclear charge
(C)increase in nuclear chargeCorrect
(D)increase in number of shells

Answer: (C)

Solution

Across a period the nuclear charge increases while electrons are added to the same shell, so atoms contract and an alkaline earth metal is smaller than the preceding

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Question ID VK-067187