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

The d-and f-Block Elements

Solution:

All the four metals have nearly the same metallic radii and hence nearly the same atomic volume. On account of higher atomic mass of copper it has high density amongst given metals.