`Be` and `Ne` have positive values of electron gain enthalpy against the general trend in their period in modern periodic table. Explain.

Explanation

In `Be`, the extra electron is to be addedx in `2p` orbital because `2s` orbital is completely filled and in `Ne`, it is to be added to a noble gas configuration. Since full-fulled orbitals and noble gas configuration are more stable, reluctancy in accepting the electron is found. So, they have positive values of electron gain enthalpy.