Atomic Number 51     Atomic Mass 121.760     Density 6.684 g/mL     State solid    

Color silvery grey     Electronegativity 2.05     Melting Point 630.5°C     Boiling Point 1750°C    

Natural Isotopes Sb-121 57.36% Sb-123 42.64%     

Abbreviated Electron Configuration [Kr] 4d¹⁰ 5s² 5p³      Discovered by Valentine in 1450.