Zr
Transition metal
Zirconium
Z 40A 91mass 91.224
Atomic model
tap a particleEvery nucleon is drawn individually — 40 protons and 51 neutrons packed into the nucleus, with 40 electrons on shells outside.
40+1
Protons
Set the element — change this and it becomes a different atom.
510
Neutrons
Change only these and you get a different isotope of the same element.
40−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 91 (40 p + 51 n)
- Electron shells
- 2 · 8 · 18 · 10 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 91.224 u
Stability
Zirconium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab