Argon

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Argon
39.948(1)



  Ar
18
1s22s22p63s23p6
[ ? ] Noble gas:
Properties:
Inert

Argon (symbol, Ar) is a chemical element with atomic number 18. It is an inert gas of the eighteenth group of the modern periodic table. It is present in a small quantity in the earth's atmosphere. It owes its non-reactivity mainly to its completely filled outermost shell.

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