Al
Post-transition metal
Aluminum
Z 13A 27mass 26.982
Atomic model
tap a particleEvery nucleon is drawn individually — 13 protons and 14 neutrons packed into the nucleus, with 13 electrons on shells outside.
13+1
Protons
Set the element — change this and it becomes a different atom.
140
Neutrons
Change only these and you get a different isotope of the same element.
13−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 27 (13 p + 14 n)
- Electron shells
- 2 · 8 · 3
- Valence shell
- 3 electrons
- Atomic mass
- 26.982 u
Stability
Aluminum has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab