Er
Lanthanide
Erbium
Z 68A 167mass 167.26
Atomic model
tap a particleEvery nucleon is drawn individually — 68 protons and 99 neutrons packed into the nucleus, with 68 electrons on shells outside.
68+1
Protons
Set the element — change this and it becomes a different atom.
990
Neutrons
Change only these and you get a different isotope of the same element.
68−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 167 (68 p + 99 n)
- Electron shells
- 2 · 8 · 18 · 30 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 167.26 u
Stability
Erbium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab