Sm
Lanthanide
Samarium
Z 62A 150mass 150.36
Atomic model
tap a particleEvery nucleon is drawn individually — 62 protons and 88 neutrons packed into the nucleus, with 62 electrons on shells outside.
62+1
Protons
Set the element — change this and it becomes a different atom.
880
Neutrons
Change only these and you get a different isotope of the same element.
62−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 150 (62 p + 88 n)
- Electron shells
- 2 · 8 · 18 · 24 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 150.36 u
Stability
Samarium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab