Argon (symbol Ar) is element number 18 of the periodic table and belongs to the “Noble gas” category. Its atomic mass is about 39.95, and its phase under standard conditions is Gas. This element sits in period 3 and group 18 of the periodic table, and its electrons are arranged in shells of 2, 8, 8. The short electron configuration of Argon is [Ne] 3s² 3p⁶. Known uses of Argon include Lighting lamps, Welding and Industrial shielding.
The electron configuration of Argon (Ar), with 18 electrons, is shown below. The last shell (shell 3) is highlighted:
Distribution of 18 electrons of Argon across shells K to M:
The noble gases are the group 18 elements: their outer shell is full, so under normal conditions they are very unreactive.
The atomic number of Argon (Ar) is 18; that is, every atom of it has 18 protons.
The electron configuration of Argon (Ar) is 1s² 2s² 2p⁶ 3s² 3p⁶; in short form it is [Ne] 3s² 3p⁶, and its last shell is 3s² 3p⁶.
The chemical symbol of Argon is Ar.
Argon is located in period 3 and group 18 and belongs to the “Noble gas” category.
The atomic mass of Argon is about 39.95 (atomic mass units).
The phase of Argon under standard conditions is Gas.
Uses of Argon include Lighting lamps, Welding and Industrial shielding.
Argon was discovered by Lord Rayleigh in 1894.
Helium (He)Neon (Ne)Krypton (Kr)Xenon (Xe)Radon (Rn)Oganesson (Og)
Helium (He)Neon (Ne)Krypton (Kr)Xenon (Xe)Radon (Rn)Oganesson (Og)
