Th
Actinide
Thorium
Z 90A 232mass 232.04
Atomic model
tap a particleEvery nucleon is drawn individually — 90 protons and 142 neutrons packed into the nucleus, with 90 electrons on shells outside.
90+1
Protons
Set the element — change this and it becomes a different atom.
1420
Neutrons
Change only these and you get a different isotope of the same element.
90−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 232 (90 p + 142 n)
- Electron shells
- 2 · 8 · 18 · 32 · 20 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 232.04 u