Stable isotope Lead (Pb)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Enrichment Level Chemical Form
Pb-204 82 122 203.973028 1.40% 99.90% Metal
Pb-204 82 122 203.973028 1.40% 99.90% Oxide
Pb-206 82 124 205.974449 24.10% >99.00% Metal
Pb-206 82 124 205.974449 24.10% >99.00% Oxide
Pb-207 82 125 206.975880 22.10% 72.00->99.00% Metal
Pb-207 82 125 206.975880 22.10% 72.00->99.00% Oxide
Pb-208 82 126 207.976636 52.40% 97.80->99.50% Metal
Pb-208 82 126 207.976636 52.40% 97.80->99.50% Oxide

Properties of Lead

Name Lead
Symbol Pb
Atomic number 82
Atomic weight 207.2
Standard state Solid at 298 °K
CAS Registry ID 7439-92-1
Group in periodic table 14
Group name None
Period in periodic table 6
Block in periodic table p-block
Color Bluish white
Classification Metallic
Melting point 327.46 °C
Boiling point 1740 °C
Thermal conductivity 35.3 W/(m·K) at 298.2 °K
Electrical resistivity 20.65 µΩ·cm at 20 °C
Electronegativity 1.8
Specific heat 0.128 J/(g·K) at 20 °C
Heat of vaporization 178 kJ·mol-1 at 1740 °C
Heat of fusion 4.77 kJ·mol-1
Density of liquid 10.66 g/cm3 at 327.46 °C
Density of solid 11.3 g/cm3
Mohs hardness scale 1
Electron configuration [Xe]4f145d106s26p2
Atomic radius 1.75 Å
Covalent radius (sp3) 1.44 Å
Ionic radius Pb2+: 1.18 Å; Pb4+: 0.70 Å
Oxidation states +2, +4