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Which of these is not a noble gas?

+2 votes

Which of these is not a noble gas?
A. Krypton
B. Xenon
C. Hydrogen
D. Helium

posted Aug 12, 2017 by Maninder Bath

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1 Answer

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Hydrogen is not a Noble gas. In order to be a nobel gas, a gas has to have a fully filled outermost shell.
For example - Helium's outer most shell is completely filled and its a noble gas.
Helium Noble gas

Hydrogen - But Hydrogen (H) has the shell configuration of 1s^1.

answer Aug 14, 2017 by Mohammed S
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