Cl
Halogen
Chlorine
Z 17A 35mass 35.45
Atomic model
tap a particleEvery nucleon is drawn individually — 17 protons and 18 neutrons packed into the nucleus, with 17 electrons on shells outside.
17+1
Protons
Set the element — change this and it becomes a different atom.
180
Neutrons
Change only these and you get a different isotope of the same element.
17−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 35 (17 p + 18 n)
- Electron shells
- 2 · 8 · 7
- Valence shell
- 7 electrons
- Atomic mass
- 35.45 u
Stability
Chlorine has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab