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Argon

(Ar)

288

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Category

Noble gas

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Relative atomic mass

39.948

Density

1.784

Melting point (°C)

-189.3

Boiling point (°C)

-185.9

Electronegativity (Pauling)

—

Discovery year

1894

Discovered by

William Ramsay Lord Rayleigh

Electrons: 18

Protons: 18

Neutrons: 22

Wikipedia

created by @lukaswyss

Argon (Ar) – Element 18