Argon is a noble gas with a relative abundance of 0.94% in our atmosphere. It is the third most abundant gas after nitrogen (relative abundance ~ 78%) and oxygen (relative abundance ~ 21%).
It belongs to group 18 (like all the noble gases) and 3rd period in the periodic table of elements. It has an atomic number of 18 and an electronic configuration of 1s2, 2s2, 2p6, 3s2, 3p6. It has fully filled outer electronic orbitals and hence is a noble gas. It is practically inert and is commonly used for creating inert environments. It is most commonly used in welding. It has 3 known isotopes: Ar(36): 0.3336%, Ar(38): 0.0629% and Ar(40): 99.6035%. Thus, Ar(40) is the most abundant natural form of this element.
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