Question

Why metallic radius is larger than covalent radius?

Answer 1

A cation has a positive charge. The reason why it has a positive charge is due to the loss of electrons. When it loses electrons, there are less electron-electron repulsions around the nucleus, so the radius of the cation becomes smaller than its normal size. 

An anion is the opposite. It gains electrons, so there are more electron-electron repulsions, forcing it's radius to go into a larger size in order to compensate for those repulsions and obtain a new equilibrium distance.

Answer 2

Answer:

Explanation: metal ions are touching the electrons and are not like overlapping which is the case of covalent radii. Because of this ,metallic radii of atoms is greater than the covalent radii of those metals..

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