Sc
Transition metal
Scandium
Z 21A 45mass 44.956
Atomic model
tap a particleEvery nucleon is drawn individually — 21 protons and 24 neutrons packed into the nucleus, with 21 electrons on shells outside.
21+1
Protons
Set the element — change this and it becomes a different atom.
240
Neutrons
Change only these and you get a different isotope of the same element.
21−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 45 (21 p + 24 n)
- Electron shells
- 2 · 8 · 9 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 44.956 u
Stability
Scandium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab