Rb
Alkali metal
Rubidium
Z 37A 85mass 85.468
Atomic model
tap a particleEvery nucleon is drawn individually — 37 protons and 48 neutrons packed into the nucleus, with 37 electrons on shells outside.
37+1
Protons
Set the element — change this and it becomes a different atom.
480
Neutrons
Change only these and you get a different isotope of the same element.
37−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 85 (37 p + 48 n)
- Electron shells
- 2 · 8 · 18 · 8 · 1
- Valence shell
- 1 electrons
- Atomic mass
- 85.468 u
Stability
Rubidium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab