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Density

Metallic radi...

Question

Metallic radii of some transition elements are given below. Which of these elements will have highest density?
Element : Mn Fe Co Cu
Metallic radii/pm: 137 126 125 128

A

Fe

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B

Mn

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C

Co

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D

Cu

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Solution

The correct option is D Cu
The transition elements are much denser than the s-block elements and show a gradual increase in density from scandium to copper. This trend in density can be explained by the small and irregular decrease in metallic radii coupled with the relative increase in atomic mass.

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