Mg
Alkaline earth metal
Magnesium
Z 12A 24mass 24.305
Atomic model
tap a particleEvery nucleon is drawn individually — 12 protons and 12 neutrons packed into the nucleus, with 12 electrons on shells outside.
12+1
Protons
Set the element — change this and it becomes a different atom.
120
Neutrons
Change only these and you get a different isotope of the same element.
12−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 24 (12 p + 12 n)
- Electron shells
- 2 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 24.305 u
Stability
Magnesium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab