The size of isoelectronic species $- F, N a^{+}$ and $M g^{2 +}$ is effected by:

Nuclear charge.

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Valence principal quantum number (n).

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Electron-electron interaction in the outer orbitals.

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Atomic mass.

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Solution

The correct option is A Nuclear charge.
As the atomic radius increases, nuclear charge decreases, the electrons will become more loosely bound.
Atomic radius $\propto$ $\frac{1}{N u c l e a r C h a r g e}$
Order of Size : ${M g}^{2 +} < {N a}^{+} < F^{-}$

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