\(N^{3-}, O^{2-}\) and \(F^{-}\) contains ten electrons each. Hence, they are isoelectronic species.
For isoelectronic species, the nuclear charge increases on moving from left to right in a period.
This decreases the ionic radii as the valence electrons are more strongly attracted by the nucleus.
$(A)$ $\mathrm{O}$ $(B)$ $\mathrm{N}$ $(C)$ Be $(D)$ $\mathrm{F}$ $(E)$ $B$
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