Atomic number:	1		Atomic weight:	1.00794
Shells:	1		Orbitals:	1s1
Melting point:	-255.34°C		Boiling point:	-252.87°C
Covalent radius:	0.32	Å	Atomic volume:	14.4	cm³/mol
Atomic radius:	0.79	Å	Ionic radius:	1.54(+1)	Å
Electronegativity:	2.20		Oxidation states:	±1
1st ionization pot.:	13.5984	V	2nd ionization pot.:	--	V
3rd ionization pot.:	--	V	Specific heat:	14.304	J/gK
Heat of fusion:	0.05868	kJ/mol	Heat of vapor.:	0.44936	kJ/mol
Thermal conduct.:	0.001815	W/cmK	Electrical conduct.:	--	10^6/cm ohm
Density:	0.00008988	g/cm³	Valence:	1