Question

Which is true from the following?
(A) Size of Al³⁺ < Size of Al
(B) Size of Al³⁺ > Size of Al
(C) Size of F⁻ < Size of F
(D) Size of Na⁺ < Size of Na

Answer 1

Na sodium is large in size

Answer 2

Answer:

Correct option is (A) and (D)

Explanation:

Reason:

The size of the ions follows the order:

Negatively charged ion > Neutral atom > Positively charged ion

This is because the size of the ions increases when the electrons are added to the outermost shell of an atom.

This happens due to the increase in electron-electron repulsion.

Moreover, when the electrons are removed from an atom, then the effective nuclear charge that is experienced by the outermost electron increases.  

Thus the size of the positively charged ion is least.