O
Reactive nonmetal
Oxygen
Z 8A 16mass 15.999
Atomic model
tap a particleEvery nucleon is drawn individually — 8 protons and 8 neutrons packed into the nucleus, with 8 electrons on shells outside.
8+1
Protons
Set the element — change this and it becomes a different atom.
80
Neutrons
Change only these and you get a different isotope of the same element.
8−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 16 (8 p + 8 n)
- Electron shells
- 2 · 6
- Valence shell
- 6 electrons
- Atomic mass
- 15.999 u
Stability
Oxygen has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab