Which of the following relation is correct with respect first (I) and second (II) ionisation of sodius and magnesium?

Which of the following relation is correct with respect first (I) and second (II) ionisation potential of sodium and magnesium?

Which one of the following relations is correct with respect to first (I) and second (II) ionization potentials of sodium and Magnesium?

Which one of the following relations is correct with respect to first (I) and second (II) ionisation potentials of Na and Mg?

Which of the following relation is correct with respect to first (I) and second (II) ionization enthalpies of potassium and calcium?

Which of the following relation is correct with respect to first (I) and second (II) ionization enthalpies of potassium and calcium?

Compare the first and second ionisation enthalpies of sodium and magnesium .

Which of the following element has greatest difference between the first and second ionisation enthalpies?