Ho
Lanthanide
Holmium
Z 67A 165mass 164.93
Atomic model
tap a particleEvery nucleon is drawn individually — 67 protons and 98 neutrons packed into the nucleus, with 67 electrons on shells outside.
67+1
Protons
Set the element — change this and it becomes a different atom.
980
Neutrons
Change only these and you get a different isotope of the same element.
67−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 165 (67 p + 98 n)
- Electron shells
- 2 · 8 · 18 · 29 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 164.93 u
Stability
Holmium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab