Na
Alkali metal
Sodium
Z 11A 23mass 22.99
Atomic model
tap a particleEvery nucleon is drawn individually — 11 protons and 12 neutrons packed into the nucleus, with 11 electrons on shells outside.
11+1
Protons
Set the element — change this and it becomes a different atom.
120
Neutrons
Change only these and you get a different isotope of the same element.
11−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 23 (11 p + 12 n)
- Electron shells
- 2 · 8 · 1
- Valence shell
- 1 electrons
- Atomic mass
- 22.99 u