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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?

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    $\begingroup$ On chemical properties helium is like a noble gas not a metal. It is chemically unreactive like noble gases but unlike metals; it is not electrically conductive even as a solid, unlike metals. Exactly which properties are metal like and not noble gas like? $\endgroup$ – matt_black Dec 29 '18 at 21:25
  • $\begingroup$ en.wikipedia.org/wiki/Metal $\endgroup$ – aventurin Dec 30 '18 at 10:56
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  • 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.

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