Br
Halogen
Bromine
Z 35A 80mass 79.904
Atomic model
tap a particleEvery nucleon is drawn individually — 35 protons and 45 neutrons packed into the nucleus, with 35 electrons on shells outside.
35+1
Protons
Set the element — change this and it becomes a different atom.
450
Neutrons
Change only these and you get a different isotope of the same element.
35−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 80 (35 p + 45 n)
- Electron shells
- 2 · 8 · 18 · 7
- Valence shell
- 7 electrons
- Atomic mass
- 79.904 u
Stability
Bromine has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab