K
Alkali metal
Potassium
Z 19A 39mass 39.098
Atomic model
tap a particleEvery nucleon is drawn individually — 19 protons and 20 neutrons packed into the nucleus, with 19 electrons on shells outside.
19+1
Protons
Set the element — change this and it becomes a different atom.
200
Neutrons
Change only these and you get a different isotope of the same element.
19−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 39 (19 p + 20 n)
- Electron shells
- 2 · 8 · 8 · 1
- Valence shell
- 1 electrons
- Atomic mass
- 39.098 u