Atomic number:	51		Atomic weight:	121.757
Shells:	2,8,18,18,5		Orbitals:	[Kr] 4d10 5s2 5p3
Melting point:	630.74°C		Boiling point:	1587°C
Covalent radius:	1.40	Å	Atomic volume:	18.23	cm³/mol
Atomic radius:	1.53	Å	Ionic radius:	.76 (+3)	Å
Electronegativity:	2.05		Oxidation states:	(±3),5
1st ionization pot.:	8.64	V	2nd ionization pot.:	16.53	V
3rd ionization pot.:	25.30	V	Specific heat:	0.21	J/gK
Heat of fusion:	19.870	kJ/mol	Heat of vapor.:	77.140	kJ/mol
Thermal conduct.:	0.243	W/cmK	Electrical conduct.:	0.0288	10^6/cm ohm
Density:	6.684	g/cm³	Valence:	0,-3,3,5