Atomic number:	78		Atomic weight:	195.08
Shells:	2,8,18,32,17,1		Orbitals:	[Xe] 4f14 5d9 6s1
Melting point:	1772°C		Boiling point:	3827°C
Covalent radius:	1.30	Å	Atomic volume:	9.10	cm³/mol
Atomic radius:	1.83	Å	Ionic radius:	.63 (+4)	Å
Electronegativity:	2.28		Oxidation states:	2,(4)
1st ionization pot.:	9.0	V	2nd ionization pot.:	18.563	V
3rd ionization pot.:	--	V	Specific heat:	0.13	J/gK
Heat of fusion:	19.60	kJ/mol	Heat of vapor.:	510.0	kJ/mol
Thermal conduct.:	0.716	W/cmK	Electrical conduct.:	0.0966	10^6/cm ohm
Density:	21.45	g/cm³	Valence:	2,3,4