Account for the following:
A cation is always smaller that its parent atom.

Account for the observation that cations are always smaller than the parent atom while anions are always larger than the parent atom.

A graph of aromic radius versus atomic number is given blow: Account for the observation that cations are always smaller than the parent atom while anions are always smaller the parent atom.

Account for the following: NH_3 acts-as a Lewis base.

Account for the following: H_3PO_3 is dibasic.

Account for the following:- Bleaching action of Cl_2 .

Account for the following: H_2O_2 is a bleaching agent.

Account for the following:- Phosphine is a weaker base than NH_3 .

Account for the following: Atomic radius decreases from left to right in a period

Account for the following: 'Li' and 'Mg' show similar properties

Account for the following: BF_3 is planar but NH_3 is not.