Question

Which of the following has the highest positive electron gain enthalpy?
1)F. 2)O-. 3)Na+. 4)Mg2+

Answer 1

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.

Answer 2

Answer:

o-

Explanation:

as the flourine has highest negatice electrom gain enahly

mg2+ and na +have short radius thus thwy will attract electrons but 0- has longer radius thus requires greater energy to attract an electron..