Ar - Argon

Ar - Argon

Men in Black
Electronic configuration The argon or argo (from the Greek ἀργός -όν "argòs -òn" meaning: lazy) is the chemical element of the periodic table which has the symbol Ar and atomic number 18. It is a noble gas of period 3 and constitutes approximately 0.94% of the Earth's atmosphere. #Ar #Argon #Electronic_configuration_Argon
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