Question

Metallic radii of some transition elements are given below. Which of these elements will have the highest density?

Element	$Fe$	$Co$	$Ni$	$Cu$
Metallic radii/pm	126	125	125	128

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

Answer 1

The correct option is D $Cu$

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 $Cu$ will have highest density.