Li
Alkali metal
Lithium
Z 3A 7mass 6.94
Atomic model
tap a particleEvery nucleon is drawn individually — 3 protons and 4 neutrons packed into the nucleus, with 3 electrons on shells outside.
3+1
Protons
Set the element — change this and it becomes a different atom.
40
Neutrons
Change only these and you get a different isotope of the same element.
3−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 7 (3 p + 4 n)
- Electron shells
- 2 · 1
- Valence shell
- 1 electrons
- Atomic mass
- 6.94 u
Stability
Lithium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab