Ra
Alkaline earth metal
Radium
Z 88A 226mass 226
Atomic model
tap a particleEvery nucleon is drawn individually — 88 protons and 138 neutrons packed into the nucleus, with 88 electrons on shells outside.
88+1
Protons
Set the element — change this and it becomes a different atom.
1380
Neutrons
Change only these and you get a different isotope of the same element.
88−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 226 (88 p + 138 n)
- Electron shells
- 2 · 8 · 18 · 32 · 18 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 226 u