Q.

Which one of the following elements is an example of noble gas?

A. Nitrogen
B. Hydrogen
C. Chlorine
D. Helium
Answer» D. Helium
Explanation: Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]).
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