A) \[F,\,\,Cl,\,\,Br,\,\,I\]
B) \[Na,\,\,K,\,\,Rb,\,\,Cs\]
C) \[Li,\,\,Be,\,\,B,\,\,C\]
D) \[Fe,\,\,Co,\,\,Ni,\,\,Cu\]
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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