Bromine

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 35
Element Bromine
Symbol Br
Atomic Mass 79.904 u
Number of Neutrons 45 (most common isotope, Bromine-80)
Number of Protons 35
Number of Electrons 35
Period 4
Group 17
Phase Liquid
Radioactive No
Natural Yes
Metal No
Nonmetal Yes
Metalloid No
Type Halogen
Atomic Radius 94 pm
Electronegativity 2.96 (Pauling scale)
First Ionization Energy 11.814 eV
Density 3.12 g/cm³
Melting Point −7.2 °C
Boiling Point 58.8 °C
Number of Isotopes 2 stable (Bromine-79, Bromine-81)
Discoverer Antoine Jérôme Balard
Year 1826
Specific Heat 0.474 J/g·K
Number of Shells 4
Number of Valence Electrons 7
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