Atomic number:	69		Atomic weight:	168.93421
Shells:	2,8,18,31,8,2		Orbitals:	[Xe] 4f13 6s2
Melting point:	1545°C		Boiling point:	1950°C
Covalent radius:	1.56	Å	Atomic volume:	2.42	cm³/mol
Atomic radius:	2.42	Å	Ionic radius:	1.09 (+3)	Å
Electronegativity:	1.25		Oxidation states:	(3),2
1st ionization pot.:	6.1843	V	2nd ionization pot.:	12.054	V
3rd ionization pot.:	26.367	V	Specific heat:	0.16	J/gK
Heat of fusion:	16.840	kJ/mol	Heat of vapor.:	191.0	kJ/mol
Thermal conduct.:	0.168	W/cmK	Electrical conduct.:	0.0150	10^6/cm ohm
Density:	9.33	g/cm³	Valence:	3