Selenium vs Lead

← Back to Periodic Table
PropertySe SeleniumPb Lead
Atomic number3482
SymbolSePb
NameSeleniumLead
Categorynonmetalpost-transition-metal
Standard Atomic Weight78.971 u207.2 u
Period46
Group1614
Blockpp
Phase at STPsolidsolid
Electron configuration[Ar]4s23d104p4[Xe]6s24f145d106p2
Oxidation states[-2, -1, 0, 1, 2, 3, 4, 5, 6][-4, -2, -1, 0, 1, 2, 3, 4]
Electronegativity (Pauling)2.552.33
Electron affinity2.0206 eV0.364 eV
Density4809 kg/m³1.134200e+4 kg/m³
Melting point220.5 °C327.46 °C
Boiling point684.85 °C1748.85 °C
Discovery year18172021