H - Hydrogen

This flammable gas is lighter than air and the most abundant element in the universe. Henry Cavendish discovered that hydrogen was an element in 1766.

Atomic number - 1 Density g/L 0 .08987

Atomic weight u 1 .0079 Melting point K 14 .025

Bonding radius A 0 .32 Boiling point K 20 .268

Atomic radius A 0 .79 Heat of vaporization kJ/mol 0 .44936

Ionization Potential V 13 .598 Heat of fusion kJ/mol 0 .05868

Electronegativity - 2 .2 Specific heat J/gK 14 .304

The oxide is amphoteric.
Crystal are hexagonal.

Electron config. : 1s¹

Isotopes of H: Click mass number for decay process, product for element page.

001 99.985%

Stable

1.0078250 002 0.015%

Stable

2.0141017 003
12.33 yr
B-
He-3
3.0160492 004
5.42 MeV
n,2.980 MeV
H-3
4.0279121 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Atomic number	-	1		Density	g/L	0	.08987
Atomic weight	u	1	.0079	Melting point	K	14	.025
Bonding radius	A	0	.32	Boiling point	K	20	.268
Atomic radius	A	0	.79	Heat of vaporization	kJ/mol	0	.44936
Ionization Potential	V	13	.598	Heat of fusion	kJ/mol	0	.05868
Electronegativity	-	2	.2	Specific heat	J/gK	14	.304
The oxide is amphoteric.				Crystal are hexagonal.
Electron config. : 1s¹