Bismuth

Chaitra 26/06/2026 19:58:09 Updated 26/06/2026 19:58:09

Property	Value
Atomic Number	83
Element	Bismuth
Symbol	Bi
Atomic Mass	208.980 u
Number of Neutrons	126 (most common isotope, Bismuth-209)
Number of Protons	83
Number of Electrons	83
Period	6
Group	15
Phase	Solid
Radioactive	Yes (Bi-209 is very weakly radioactive)
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Post-transition Metal
Atomic Radius	143 pm
Electronegativity	2.02 (Pauling scale)
First Ionization Energy	7.289 eV
Density	9.78 g/cm³
Melting Point	271.4 °C
Boiling Point	1564 °C
Number of Isotopes	1 naturally occurring (Bi-209)
Discoverer	Known since ancient times
Year	Unknown
Specific Heat	0.122 J/g·K
Number of Shells	6
Number of Valence Electrons	5