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Which of the following is not a noble gas? 

(a) Neon 

(b) Hydrogen

(c) Helium 

(d) Argon

1 Answer

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(b) Hydrogen

They belong to group 18 of the periodic table. Group 18 of the periodic table includes He, Ne, Ar, Kr, Xe and Rn. Therefore, we can conclude that Hydrogen is not a Noble gas.

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