The statement(s) that are correct about the species $$\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}$$ and $$\mathrm{Mg}^{2+}$$.

(A) All are isoelectronic

(B) All have the same nuclear charge

(C) $$\mathrm{O}^{2-}$$ has the largest ionic radii

(D) $$\mathrm{Mg}^{2+}$$ has the smallest ionic radii

Choose the most appropriate answer from the options given below :

The correct order of the first ionization enthalpy is

Given below are two statements :

Statement I : The correct order of first ionization enthalpy values of $$\mathrm{Li}, \mathrm{Na}, \mathrm{F}$$ and $$\mathrm{Cl}$$ is $$\mathrm{Na}<\mathrm{Li}<\mathrm{Cl}<\mathrm{F}$$.

Statement II : The correct order of negative electron gain enthalpy values of $$\mathrm{Li}, \mathrm{Na}, \mathrm{F}$$ and $$\mathrm{Cl}$$ is $$\mathrm{Na}<\mathrm{Li}<\mathrm{F}<\mathrm{Cl}$$

In the light of the above statements, choose the correct answer from the options given below :

The correct order of first ionization enthalpy values of the following elements is :

(A) O

(B) N

(C) Be

(D) F

(E) B

Choose the correct answer from the options given below :