MHT CET 2026 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2026

Identify the alkali metal having the smallest atomic size from following

(A)SodiumCorrect
(B)Potassium
(C)Rubidium
(D)Caesium

Answer: (A)

Solution

Atomic size increases down a group because each successive element has an additional electron shell, and this outweighs the increase in nuclear charge. Among the alkali metals the order of atomic radii is Li (152 pm) < Na (186 pm) < K (227 pm)

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Question ID VK-098609