Cr
Transition metal
Chromium
Z 24A 52mass 51.996
Atomic model
tap a particleEvery nucleon is drawn individually — 24 protons and 28 neutrons packed into the nucleus, with 24 electrons on shells outside.
24+1
Protons
Set the element — change this and it becomes a different atom.
280
Neutrons
Change only these and you get a different isotope of the same element.
24−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 52 (24 p + 28 n)
- Electron shells
- 2 · 8 · 12 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 51.996 u
Stability
Chromium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab