JEE Main Chemistry question

The chemistry of lithium is very much similar to that of magnesium even though they are placed in different groups. The reason is:

(A)Both have nearly the same size
(B)The ratio of their charge to size is nearly the sameCorrect
(C)Both have similar electronic configuration
(D)Both are found together in nature

Answer: (B)

Solution

Lithium and magnesium show a diagonal relationship because, despite being in different groups, their ionic charge-to-size (charge density/polarising power) ratios are nearly equal — is smaller but singly charged, while is slightly larger but doubly charged, giving comparable polarising power and hence

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Question ID VK-137829