Lead

Koushik 26/06/2026 19:58:09 Updated 26/06/2026 19:58:09
Property Value
Atomic Number 82
Element Lead
Symbol Pb
Atomic Mass 207.2 u
Number of Neutrons 126 (most common isotope, Lead-208)
Number of Protons 82
Number of Electrons 82
Period 6
Group 14
Phase Solid
Radioactive No
Natural Yes
Metal Yes
Nonmetal No
Metalloid No
Type Post-transition Metal
Atomic Radius 154 pm
Electronegativity 2.33 (Pauling scale)
First Ionization Energy 7.417 eV
Density 11.34 g/cm³
Melting Point 327.46 °C
Boiling Point 1749 °C
Number of Isotopes 4 stable (Pb-204, Pb-206, Pb-207, Pb-208)
Discoverer Known since ancient times
Year Unknown
Specific Heat 0.128 J/g·K
Number of Shells 6
Number of Valence Electrons 4
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