Explain the variation in (1) ionisation enthalpy and (2) electron gain – InterviewSolution

1.

Explain the variation in (1) ionisation enthalpy and (2) electron gain enthalpy in group 18 elements.

Answer»

(1) Ionisation enthalpy :

In general, group 18 elements have high values of ionisation enthalpy.
In a period, each noble gas has the highest ionisation enthalpy.
The noble gases have electronic configuration, ns² np⁶, they have complete octet with paired electrons and very stable closed-shell electronic configuration. Therefore high energy is required to remove the electron from valence shell.
Down the group ionisation enthalpy decreases.

(2) Electron gain enthalpy :

Group 18 elements have electronic configuration ns² np⁶ and complete octet of electrons, hence they have no tendency to accept electrons.
Therefore, they have a large positive electron gain enthalpy.

Discussion

No Comment Found

Related InterviewSolutions