JEE Advanced Chemistry question

Atoms of the transition elements are smaller than those of the s-block elements. This is because of

(A)Usual contraction in size across a horizontal period
(B)Orbital electrons added to the penultimate d-shell rather than to the outer shell of the atom
(C)Both (a) and (b)Correct
(D)None of the above

Answer: (C)

Solution

Two effects combine here: the general periodic trend of decreasing atomic size across a period due to increasing nuclear charge (a), and the specific feature of transition metals that newly added electrons go into the inner,

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Question ID VK-159688