neon

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Symbol:

Ne

Atomic Number:

10

Relative Atomic Mass:

20.1797 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

5 x 10^-7% (mass fraction)

Electron Configuration:

[He]2s²2p⁶

Van der Waals Radius:

150pm

Boiling Point:

-246.0°C

Density:

0.84 g L^-1 (at 1013 mbar)

First Ionisation Energy:

21.564 eV

Number of Natural Isotopes:

3

Mass Number of the Most Abundant Isotopes:

20 g mol^-1 a 90.5% abundance

21 g mol^-1 a 0.3% abundance

22 g mol^-1 a 9.2% abundance