Po
Post-transition metal
Polonium
Z 84A 209mass 209
Atomic model
tap a particleEvery nucleon is drawn individually — 84 protons and 125 neutrons packed into the nucleus, with 84 electrons on shells outside.
84+1
Protons
Set the element — change this and it becomes a different atom.
1250
Neutrons
Change only these and you get a different isotope of the same element.
84−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 209 (84 p + 125 n)
- Electron shells
- 2 · 8 · 18 · 32 · 18 · 6
- Valence shell
- 6 electrons
- Atomic mass
- 209 u