Question

noble gases have large positive electron gain enthalpy why ​

Answer 1

Answer:

Noble gases have large positive electron gain enthalpies because the electron has to enter the next-higher principal quantum level leading to a very unstable electronic configuration.

Answer 2

Answer:

As they have stable configuration still if it gains electron then it required a lot of energy to add that electron then its configuration becomes similar to group 1 which are very reactive. hence due to high energy requirement, it has positive electron gain enthalpy.

Explanation:

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

An electron has to enter the next higher principal quantum level which leads to a very unstable electronic configuration.