MHT CET 2024 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2024

Which of the following element in +1 oxidation state has largest ionic radius ?

(A)RbCorrect
(B)K
(C)Na
(D)Li

Answer: (A)

Solution

Li, Na, K and Rb are alkali metals of group 1 and each forms a ion. Going down the group, a new electron shell is added at every step (the ions Li, Na, K, Rb have 1, 2, 3 and 4 filled shells respectively), and the increase in the number of shells outweighs the increase in nuclear charge, so

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Question ID VK-096664