Question

Electron gain enthalpy of noble gases is positive. why ?​

Answer 1

Answer:

Electron gain enthalpy values of noble gases are positive because they have stable electronic configuration and thus have no tendency to take additional electron.

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Answer 2

Answer:

Electron gain enthalpy of noble gases is POSTIVE

Due to the stable configuration, they do not accept an electron and hence they have large positive electron gain enthalpy.

Explanation:

Noble gases already have a very stable fully filled electronic configuration. Addition of another electron to a neutral inert gas atom would lead to high electronic repulsion and it would also destroy the already stable electronic configuration,which is highly unfavorable.

So, addition of an electron to the neutral atom requires a large amount of energy. As a result, the EGE ( electron gain enthalpy) of noble gases is positive.