Sb
Metalloid
Antimony
Z 51A 122mass 121.76
Atomic model
tap a particleEvery nucleon is drawn individually — 51 protons and 71 neutrons packed into the nucleus, with 51 electrons on shells outside.
51+1
Protons
Set the element — change this and it becomes a different atom.
710
Neutrons
Change only these and you get a different isotope of the same element.
51−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 122 (51 p + 71 n)
- Electron shells
- 2 · 8 · 18 · 18 · 5
- Valence shell
- 5 electrons
- Atomic mass
- 121.76 u
Stability
Antimony has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab