hydrogen

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Symbol:

H

Atomic Number:

1

Relative Atomic Mass:

1.00794 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

4.7% (mass fraction)

Electron Configuration:

1s

Oxidation States:

I, -I

Atomic Radius:

37.3pm

Covalent Radius:

30pm

Ionic Radius:

21pm (for -1 oxidation state)

Van der Waals Radius:

100pm

Boiling Point:

-252.9°C

Density:

0.084 g L^-1 (at 1013mbar)

First Ionisation Energy:

13.598 eV

Reduction Potential:

0 V

for H¹⁺ + 1e^- a H_(s)

Electronegativity (Allred and Rochow):

2.2

Number of Natural Isotopes:

2

Mass Number of the Most Abundant Isotopes:

1 g mol^-1 a 99.985% abundance

2 g mol^-1 a 0.015% abundance