Np
Actinide
Neptunium
Z 93A 237mass 237
Atomic model
tap a particleEvery nucleon is drawn individually — 93 protons and 144 neutrons packed into the nucleus, with 93 electrons on shells outside.
93+1
Protons
Set the element — change this and it becomes a different atom.
1440
Neutrons
Change only these and you get a different isotope of the same element.
93−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 237 (93 p + 144 n)
- Electron shells
- 2 · 8 · 18 · 32 · 23 · 8 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 237 u