Question

Find the odd one out.

A Neon Correct Answer Incorrect Answer
B Argon Correct Answer Incorrect Answer
C Helium Correct Answer Incorrect Answer
D Hydrogen Correct Answer Incorrect Answer

Solution

Except for Hydrogen, all are noble gases. The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radioactive radon (Rn).

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