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Name the noble gas which (A)is most ab...

Name the noble gas which
(A)is most abundant in atmosphere , (B)has least boiling point.

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(A)Argon
(B)Helium, Exists as mono-atomic molecules and are held together by weak van der Waal's forces.These van der Waal's forces increase with the increase in atomic size of the atom, and therefore, the boiling points increases from He to Rn.Hence He has least boiling point.
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