Question

# Which of the following series of elements have nearly the same atomic radii?

A
F.Cl,Br,I
B
Na,K,Rb,Cs
C
Li,Be,B,C
D
Fe,Co,Ni,Cu

Solution

## The correct option is D $$Fe,Co,Ni,Cu$$These are transition metals with the $$(n-1){ d }^{ 1-10 }{ ns }^{ 1-2 }$$ configuration. The atomic number and ionic radii of transition elements in a given series show a decreasing trend for the first five elements and then becomes almost constant for the next five elements.Hence, option $$D$$ is correct.Chemistry

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