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. same
• B. $Ni$
• C. $Co$
• D. $Cu$

Answer 1

Answer: (D)

As we all know that 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 must have highest density. So the correct option is D