Os
Transition metal
Osmium
Z 76A 190mass 190.23
Atomic model
tap a particleEvery nucleon is drawn individually — 76 protons and 114 neutrons packed into the nucleus, with 76 electrons on shells outside.
76+1
Protons
Set the element — change this and it becomes a different atom.
1140
Neutrons
Change only these and you get a different isotope of the same element.
76−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 190 (76 p + 114 n)
- Electron shells
- 2 · 8 · 18 · 32 · 14 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 190.23 u
Stability
Osmium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab