How can helium be considered as a non-metal based on its chemical properties? Helium is a noble gas; it does not take part in chemical reactions under ordinary conditions. But non-metals tend to gain electrons to form negative ions. Also, there are many chemical properties that helium does not show as a non-metal. Then how can be helium considered as a non-metal by looking at is chemical properties?
- Metal atoms share electrons.
- Non-metals don't.
- Helium atoms do not share electrons. QED (this ain't quantum electrodynamics).
Of course, there are semimetals, but again, He doesn't qualify, so it's not germane to the answer.