MHT CET 2025 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2025

Which is the correct increasing order of atomic radii of Na, K, Mg, Rb?

(A)Mg < K < Na < Rb
(B)Mg < Na < K < RbCorrect
(C)Mg < Na < Rb < K
(D)Na < K < Rb < Mg

Answer: (B)

Solution

Atomic radius decreases across a period (increasing nuclear charge, same shell) and increases down a group (extra shells). Na and Mg are both in period 3: Na (186 pm) Mg (160 pm) because Mg has the higher effective nuclear

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Question ID VK-102064