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(A) All the given ions $(O^{2-}, F^{-}, Na^{+}, Mg^{2+})$ are isoelectronic,having $10$ electrons each.Ionisation potential is the energy required to

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$O^{2-}$

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(A) All the given ions $(O^{2-}, F^{-}, Na^{+}, Mg^{2+})$ are isoelectronic,having $10$ electrons each.Ionisation potential is the energy required to remove an electron from an atom or ion.For isoelectronic species,the ionisation potential increases as the nuclear charge (number of protons) increases.$O^{2-}$ has the lowest nuclear charge $(Z = 8)$ among the given ions.Therefore,it is easiest to remove an electron from $O^{2-}$,making it the species with the lowest ionisation potential.

Of the following isoelectronic ions,the one which has the lowest ionisation potential is

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