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

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a

nuclear charge (Z)

b

valence principal quantum number (n)

c

electron-electron interaction in the outer orbitals

d

none of the factors because their size is the same

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detailed solution

Correct option is A

Nuclear charge has an effect on the sizes of the isoelectronic species $F^{-}$ , $Ne$ , and ${Na}^{+}$ (Z). The attraction between the nucleus and the valence electrons will be stronger the higher the nuclear charge, and the ionic size will be smaller. As a result, $F^{-}$ has the largest ionic size while ${Na}^{+}$ has the smallest.

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