Ir
Transition metal
Iridium
Z 77A 192mass 192.22
Atomic model
tap a particleEvery nucleon is drawn individually — 77 protons and 115 neutrons packed into the nucleus, with 77 electrons on shells outside.
77+1
Protons
Set the element — change this and it becomes a different atom.
1150
Neutrons
Change only these and you get a different isotope of the same element.
77−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 192 (77 p + 115 n)
- Electron shells
- 2 · 8 · 18 · 32 · 15 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 192.22 u
Stability
Iridium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab