Atomic number:	72		Atomic weight:	178.49
Shells:	2,8,18,32,10,2		Orbitals:	[Xe] 4f14 5d2 6s2
Melting point:	2227°C		Boiling point:	4602°C
Covalent radius:	1.44	Å	Atomic volume:	13.6	cm³/mol
Atomic radius:	2.16	Å	Ionic radius:	.83 (+4)	Å
Electronegativity:	1.3		Oxidation states:
1st ionization pot.:	6.8251	V	2nd ionization pot.:	14.925	V
3rd ionization pot.:	23.32	V	Specific heat:	0.14	J/gK
Heat of fusion:	24.060	kJ/mol	Heat of vapor.:	575.0	kJ/mol
Thermal conduct.:	0.230	W/cmK	Electrical conduct.:	0.0312	10^6/cm ohm
Density:	13.2	g/cm³	Valence:	4