# Question #e7441

Jul 31, 2017

Atomic radius generaly decreases as we move from left to right.

#### Explanation:

The radius of Noble gases is the greatest as :

vanderwall radius$>$metallic radius$>$covalent radius

As we move from left to right, the effective nuclear charge(${Z}_{e f f}$)
increases but there is no change in shielding effect($\sigma$) of electrons as they are added to the outermost shell of atom.Hence the nucleus pulls the electrons closer to itself decreasing the atomic radius