Chemical element · Atomic number 35
Bromine
Bromine in the periodic table: atomic number 35, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Halogen
liquid
79.90 u
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Atomic classification
Shell occupancy
Bromine in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 7 electrons
- Electron configuration
- [Ar]4s2 3d10 4p5
- Electrons per shell
- 2 · 8 · 18 · 7
- Group
- 17
- Period
- 4
- Block
- P
- Element category
- Halogen
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Physical and chemical properties
- Atomic mass
- 79.90 u
- Standard state
- liquid
- Density
- 3.11 g/cm³
- Melting point
- 265.95 K
- Boiling point
- 331.95 K
- Electronegativity
- 2.96 (Pauling)
- First ionisation energy
- 11.814 eV
- Oxidation states
- +5, +1, -1
- Discovery
- 1826
Safety and periodic classification
Safety
Safe handling cannot be inferred from Bromine's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Bromine is in period 4, group 17 and the P block. Its direct neighbours by atomic number are Selenium and Krypton. The recorded Pauling electronegativity is 2.96. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.