As
Metalloid
Arsenic
Z 33A 75mass 74.922
Atomic model
tap a particleEvery nucleon is drawn individually — 33 protons and 42 neutrons packed into the nucleus, with 33 electrons on shells outside.
33+1
Protons
Set the element — change this and it becomes a different atom.
420
Neutrons
Change only these and you get a different isotope of the same element.
33−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 75 (33 p + 42 n)
- Electron shells
- 2 · 8 · 18 · 5
- Valence shell
- 5 electrons
- Atomic mass
- 74.922 u
Stability
Arsenic has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab