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Argon has a total of 18 electrons. There are 2, 8 and 8 electrons in the 1st, 2nd and 3rd energy levels respectively.
From Wikipedia, the free encyclopedia. Argon (Ar) has 24 known isotopes, from 30 Ar to 53 Ar and 1 isomer (32m Ar), three of which are stable, 36 Ar, 38 Ar, and 40 Ar. On Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 269 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days.