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RRB Group-D Model Paper 14 with answers for online practice
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© examsnet.com
Question : 50
Total: 100
Which noble gas is not found in the atmosphere?
Argon
Krypton
Xenon
Radon
Validate
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
t
h
Neon
0.0018
6
t
h
Argon
0.934
4
t
h
Krypton
0.0001
9
t
h
Xenon
0.000009
15
t
h
© examsnet.com
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