Argon /ˈɑrɡɒn/ ar-gon is a chemical element represented by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of theperiodic table (noble gases). Argon is the third most common gas in the Earth's atmosphere, at 0.93%, making it more common than carbon dioxide. Nearly all of this argon is radiogenic argon-40 derived from the decay of potassium-40 in the Earth's crust. In the universe, argon-36 is by far the most common argon isotope, being the preferred argon isotope produced by stellar nucleosynthesis in supernovas.Since argon is a noble gas,we cannot take a picture of it.However,I can only show you this:
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