The most abundant rare gas in the atmosphere is argon (Ar). It makes up about 0.93% of the Earth’s atmosphere. Helium (He) is the second most abundant rare gas, making up about 0.0005% of the atmosphere. Neon (Ne) and xenon (Xe) are much less abundant, making up about 0.0018% and 0.00009% of the atmosphere, respectively.
Argon is a noble gas, which means that it is very stable and does not react with other elements. It is used in a variety of applications, including lighting, welding, and cryogenics.
Helium is also a noble gas. It is the second lightest element in the universe and is used in a variety of applications, including balloons, cryogenics, and nuclear fusion.
Neon is a noble gas that is used in a variety of applications, including lighting, lasers, and signs.
Xenon is a noble gas that is used in a variety of applications, including lighting, lasers, and medical imaging.