What is the atomic mass of argon in chemistry?

The atomic mass of argon in chemistry is 39.948 atomic mass units (amu). Argon is a noble gas with the chemical symbol Ar, and it is the third-lightest element in the periodic table, after helium and neon. Its atomic mass is determined by the number of protons, neutrons, and electrons in its nucleus, and it is considered a stable, non-reactive element that does not readily form chemical bonds with other elements.

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