Question

the ionic radius of oxygen is 140pm,80pm larger than its atomic radius.EXPLAIN?

Answer 1

Ions can be both positively charged or negatively charged. I assume that by ‘ion’ u mean the positively charged species. These ions, called cations are formed when electrons from the outermost shell are taken away. This results in less repulsion between the other electrons and thus the effective nuclear charge becomes greater, which holds the outer electrons with greater force, reducing the atomic size.

Answer 2

After gaining electrons, due to increase in electron density there occurs replusions resulting in larger atomic size