Question

would you expect the second electron gain enthalpy of o as positive more negative or less negative than the first? justify your answer​

Answer 1

Explanation:

Oxygen belongs to group 16 of p block elements.It is the first member of group 16.It is a non metal & most abundant in earth crust.

When an electron is added to O atom to form O

−

ion, energy is released. Thus, the first electron gain enthalpy of O is negative.

On the other hand, when an electron is added to O

−

ion to form O

2−

ion(superoxide ion), energy has to be given out in order to overcome the strong electronic repulsions between O

−

&e

−

. Thus, the second electron gain enthalpy of O is positive.