Metallic radii of some transitions element are given below. Which of these elements will have highest density ?
`{:("Element",Fe,Co,Ni,Cu),("Metallic",126,125,125,128),("radii/pm",,,,):}`

Options

A. Fe
B. Ni
C. Co
D. Cu

Answer

D

Explanation

On moving left to right along period, metallic radius decreases while mass increases. Decrease in metallic radius coupled with increase in atomic mass results in increase in density of metal.
Hence, among the given four choices Cu belongs to right side of Periodic Table in transition metal, and it has highest density `(89 g//cm^(3))`.