Question

Between $Na^{+}$ and $F^{-}$ which is smaller and why?

URGENT PLEASE!!!

Answer 1

→ Na+ is smaller.

♦ Reason:

Na+ and F- both have 10 electrons.

However, Na+ has 11 protons while F- has 9 protons.

The protons in the nucleus attract the valence shell. So, if there are more protons, then the effective nuclear charge on the orbit will be more, and the atom would be smaller.

Here, Na+ has more number of electrons. So, its nucleus attracts the valence shell more strongly than F-.

So, Na+ is smaller.