Question

Helium is considered a noble gas because it has a ___ valence electron shell.

Answer 1

Complete.

Step-by-step explanation:

The noble gases are stable and do not generally react with other chemicals.

Electron configuration of helium is 1s2.

The inner electron shell 1s is complete (stable) when containing 2 electrons

Answer 2

Two valence electron Shell or it could be zero because it do not react.

Step-by-step explanation: