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Which one of the following is not an element of Noble gases?

  • A.Xenon
  • B.Hydrogen
  • C.Helium
  • D.Neon

Answer: B

Hydrogen is not a noble gas. It sits in group 1 of the periodic table and is highly reactive, burning in air and combining with most elements.

Helium, neon, argon, krypton, xenon and radon make up group 18, the noble gases, whose full outer shells make them almost entirely unreactive.

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