Statement I  : Effective nuclear charge of ${\mathrm{Na}}^{+}$ ion is equal to effective nuclear charge of ${\mathrm{F}}^{-}$ ion

Statement II : ${\mathrm{Na}}^{+}$and ${\mathrm{F}}^{-}$ ions are iso electronic species

Statement I and Statement II both are correct

Statement I is correct and statement II is incorrect

Both statements are incorrect

Statement I is incorrect and statement II is correct