Argon

| Introduction | History | Other Periodic Tables | Back |

Symbol:

Ar

Atomic Number:

18

Relative Atomic Mass:

39.948 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

4 x 10^-4% (mass fraction)

Electron Configuration:

[Ne]3s²3p⁶

Van der Waals Radius:

180pm

Boiling Point:

-185.7°C

Density:

1.66 g L^-1 (at 1013mbar)

First Ionisation Energy:

15.759 eV

Number of Natural Isotopes:

3

Mass Number of the Most Abundant Isotopes:

36 g mol^-1 a 0.3% abundance

38 g mol^-1 a 0.1% abundance

40 g mol^-1 a 99.6% abundance