Hf
Transition metal
Hafnium
Z 72A 178mass 178.49
Atomic model
tap a particleEvery nucleon is drawn individually — 72 protons and 106 neutrons packed into the nucleus, with 72 electrons on shells outside.
72+1
Protons
Set the element — change this and it becomes a different atom.
1060
Neutrons
Change only these and you get a different isotope of the same element.
72−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 178 (72 p + 106 n)
- Electron shells
- 2 · 8 · 18 · 32 · 10 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 178.49 u
Stability
Hafnium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab