Periodic Table · element

Argon

Ar · Z 18

atomic number

18

atomic mass

39.948

notation

Ar

group

18: Helium/Neon

period

3

state0c

Gas

state20c

Gas

occurrence

Primordial

density

0.0017837

melting pt

-189.3

boiling pt

-185.85

discovered

1894

abundance

3.5

ore minerals

the atmosphere (0.93 %)

mined as

Not mined

extraction

A by-product of cryogenic air separation, sitting between oxygen and nitrogen in the column.

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From the All Periodical Elements database in Notion, last edited 2026-08-16. This page is the row, rendered by the build; nothing on it is written by hand.