Atomic number:	59		Atomic weight:	140.90765
Shells:	2,8,18,21,8,2		Orbitals:	[Xe] 4f3 6s2
Melting point:	931°C		Boiling point:	3520°C
Covalent radius:	1.65	Å	Atomic volume:	20.8	cm³/mol
Atomic radius:	2.67	Å	Ionic radius:	1.13 (+3)	Å
Electronegativity:	1.13		Oxidation states:	(3,4)
1st ionization pot.:	5.464	V	2nd ionization pot.:	10.551	V
3rd ionization pot.:	21.62	V	Specific heat:	0.19	J/gK
Heat of fusion:	6.890	kJ/mol	Heat of vapor.:	296.80	kJ/mol
Thermal conduct.:	0.125	W/cmK	Electrical conduct.:	0.0148	10^6/cm ohm
Density:	6.77	g/cm³	Valence:	3