Q. The most abundant noble gas in atmosphere is

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Solution:

Argon is the most abundant noble gas in the atmosphere, because most of it was produced by a way lived radio Isotope of Potassium in the earth crust.
Noble gee Per cent abundance
Argon, Ar 0.93
Neon, Ne 0.0018
Helium, He 0.00052
Krypton, Kr 0.00011
Xenon, Xe 0.0000087