Question

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",,,,):}`
A. Fe
B. Ni
C. Co
D. Cu

Answer 1

Correct Answer - D
On moving left to right along, 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 transitions metal, and it has highest density `(89 g//cm^(3))`.