Eu
Lanthanide
Europium
Z 63A 152mass 151.96
Atomic model
tap a particleEvery nucleon is drawn individually — 63 protons and 89 neutrons packed into the nucleus, with 63 electrons on shells outside.
63+1
Protons
Set the element — change this and it becomes a different atom.
890
Neutrons
Change only these and you get a different isotope of the same element.
63−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 152 (63 p + 89 n)
- Electron shells
- 2 · 8 · 18 · 25 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 151.96 u
Stability
Europium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab