RRB Group-D Model Paper 14 with answers for online practice

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Question : 50 of 100

Marks: +1, -0

Which noble gas is not found in the atmosphere?

Argon
Krypton
Xenon
Radon

Solution:

In the modern periodic table, group 18 belongs to noble gases.
This group of a series of gases including Argon. Helium, Neon, Krypton, Xenon, and Radon.
Radon is the only radioactive out of all and it's also not present in the Atmosphere.

Noble Gas	Percentage(%)	Relative Abundanceto other componentsof Atmosphere
Helium	0.00052	$7^{th}$
Neon	0.0018	$6^{th}$
Argon	0.934	$4^{th}$
Krypton	0.0001	$9^{th}$
Xenon	0.000009	$15^{th}$

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