The size of isoelectronic species—${{F}^{-}}$. Ne and Na+ is affected by :

The size of isoelectronic species—${{F}^{-}}$. Ne and Na+ is affected by :
(a) nuclear charge (Z)
(b) valence principal quantum number (n)
© electron-electron interaction in the outer orbitals
(d) none of the factors because their size is the same.

(a) Nuclear charge (Z).