Question

which one has octet configuration among hydrogen and helium? give reason​

Answer 1

Answer:

The main exception to the rule is hydrogen, which is at its lowest energy when it has two electrons in its valence shell. Helium (He) is similar in that it, too, only has room for two electrons inits only valence shell. ... Therefore, these elements are most stable when theyhave two electrons.

hope it will help you : )

Answer 2

Helium has complete noble gas electronic configuration i.e. 2.

Whereas Hydrogen can donate 1 electron or can agin 1 electron to complete its octet.