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Nonmetals in the periodic seestem:
  Polyatomic nonmetal
  Diatomic nonmetal
  Noble gas
Apart frae hydrogen, nonmetals are locatit in the p-block. Helium, altho an s-block element, is normally placed abuin neon (in the p-block) on accoont o its noble gas properties.

In chemistry, a nonmetal (or non-metal) is a chemical element that maistly lacks metallic attributes.