Question

In which of the following sets the first one has lower ionization energy than the second one?

a) I and I-

b) Cl and P

c) Mg+2 and Mg+3

d) He and Li+

options:

(i) a,d
(ii) b, d
(iii) c,d
(iv) only d​

Answer 1

Answer:

(iii) c,d is the correct answer

Answer 2

Answer:

The correct option is (c) $Mg^{+2}$ and $Mg^{+3}$.

Explanation:

The successive ionization energies keep on increasing in an atom as it gets increasingly difficult to remove each successive electron. The reason for this is that the atoms or the cations become more and more positive, and electrons get held even more tightly by the nucleus.

$Mg^{+3}$ is more positive than $Mg^{+2}$ as it has more protons than electrons.

The ionization energy of $Mg^{+2}$easier than the ionization energy of $Mg^{+3}$.