Question

Helium is a noble gas but it doesn’t show octet rule.Give reason.

Answer 1

because helium contain only k shell which is completely filled with to electron

Answer 2

Helium have only two protons and hence two electrons. The K shell have only one orbital, which is s-orbital, having maximum capacity of 2 electrons.

Helium is noble gas and do follow the octet rule, however, as its valence shells can only hold two electrons, an “octet” is two electrons for it.