Question

Which has higher electron gain enthalpy- f o- na+ mg2+?

Answer 1

Answer:

1). O has the highest positive electron gain enthalpy

Explanation:

Because of the the more energy gained due to the higher internal repulsion between the electrons.

The electron gain enthalpy of an element is defined as the energy gained by the acceptance of extra electron from the neutral isolated gaseous atom to form gaseous negative ion which is an anion.

Answer 2

Answer:

Electron gain enthalpy can be defined as the inclusion of an gaseous electron into the the gaseous element or the vacant atom . Since the element Florine is neutral hence small amount of electron gain enthalpy is needed to add into the electron into it.

Since, the elements Na+ and Mg2+ which are already positively charged species hence they require electrons.

While the O- is already having excess electrons hence does not need any more, as they are having electron-electron repulsion, this causes release of more energy.