This is a picture of Lithium.
The atomic number of Lithium is 3
The names for each isotope is lithium-6 and lithium-7 and lithium-8. These are the only two that are stable. There number is 3....
Lithium does not occur as the metal in nature, but is found combined in small amounts in nearly all igneous rocks and in the waters of many mineral springs. Spodumene, petalite, lepidolite, and amblygonite are the more important minerals containing lithium.