What is the most prevalent noble gas in the atmosphere?
Argon is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is the third most common gas in the Earth's atmosphere, at 0.93%. It is more common than carbon dioxide. It is the third most abundant gas and the most frequently used of the noble gases.
The bonds between two atoms of nitrogen (78% of the atmosphere) in the N2 molecule make it inert for many purposes. However under high heat (lightning for example) it reacts with oxygen to form nitrogen compounds. Argon at 1% of the atmosphere is a noble gas and is inert under all atmospheric conditions.