Question : Which of the following is not a noble gas?
Option 1: Helium
Option 2: Hydrogen
Option 3: Neon
Option 4: Argon
Correct Answer: Hydrogen
Solution : The correct answer is Hydrogen .
Hydrogen is not a noble gas. The symbol of Hydrogen is H and the atomic number is 1. It is the lightest element and at standard conditions, is a gas of diatomic molecules with the formula H 2 . The seven elements of Group 18 are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) and oganesson (Og).
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