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Which of these is not a noble gas?

+1 vote
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Which of these is not a noble gas?
A. Krypton
B. Xenon
C. Hydrogen
D. Helium

posted 6 days ago 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.
Hydrogen

answer 5 days ago by Mohammed S

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