Atomic number:	81		Atomic weight:	204.3833
Shells:	2,8,18,32,18,3		Orbitals:	[Xe] 4f14 5d10 6s2 6p1
Melting point:	303.5°C		Boiling point:	1457°C ±10°C
Covalent radius:	1.48	Å	Atomic volume:	17.2	cm³/mol
Atomic radius:	2.08	Å	Ionic radius:	1.59 (+1)	Å
Electronegativity:	2.04		Oxidation states:	3,(1)
1st ionization pot.:	6.1083	V	2nd ionization pot.:	20.428	V
3rd ionization pot.:	29.829	V	Specific heat:	0.13	J/gK
Heat of fusion:	4.142	kJ/mol	Heat of vapor.:	164.10	kJ/mol
Thermal conduct.:	0.461	W/cmK	Electrical conduct.:	0.0617	10^6/cm ohm
Density:	11.85	g/cm³	Valence:	1,3