A) \[\text{ }\!\!~\!\!\text{ F, Cl, Br, I}\]
B) \[\text{ }\!\!~\!\!\text{ Na, K, Rb, Cs}\]
C) \[\text{Li,}\,\text{Be,}\,\text{B,}\,\text{C}\]
D) \[\text{ }\!\!~\!\!\text{ Fe, Co, Ni, Cu}\]
Correct Answer: D
Solution :
These are transition metals with the \[(n-1){{d}^{1-10}}n{{s}^{1-2}}\]configuration. The atomic and ionic radii of transition elements in a given series show a decreasing trend for first five elements and then becomes almost constant for next five elements.
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