Number of protons in Lead is 82. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Atomic Mass of Lead. Atomic Number of Lead is 82. Melting point of Lead is 327,5 °C and its the boiling point is 1740 °C. The symbol came from the Latin word plumbum, meaning lead: Date and Place of Discovery: Known to the ancients: Discovered by: Unknown: Common Compounds: Lead azide [Pb(N 3) 2] Lead chloride (PbCl 2) Lead chromate (PbCrO 4) Lead hydrogen arsenate (PbHAsO 4) Lead iodide (PbI 2) Lead nitrate [Pb(NO 3) 2] Lead oxide (PbO 2) Lead selenide (PbSe) Lead sulfate (PbSO 4) Chemical symbol for Lead is Pb. Atomic Number of Lead. Element Lead (Pb), Group 14, Atomic Number 82, p-block, Mass 207.2. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. The chemical symbol for Lead is Pb. Atomic weight of Lead is 207.2 u or g/mol. Atomic mass of Lead is 207.2 u. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure.