Q.

Which of the following is a mono- atomic gas?

A. Oxygen
B. Neon
C. Nitrogen
D. Fluorine
Answer» B. Neon
Explanation: All elements will be monatomic in the gas phase at sufficiently high temperatures. At standard temperature and pressure (STP), all of the noble gases are monatomic. These are helium, neon, argon, krypton, xenon and radon. Monatomic hydrogen comprises about 75% of the elemental mass of the universe.
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