Lithium is a metal element with the symbol Li, and the corresponding simple substance is silver white soft metal, which is also the metal with the lowest density. It is used in atomic reactors, light alloys and batteries. Lithium and its compounds are not as typical as other alkali metals, because lithium has a large charge density and a stable helium type double electron layer, which makes lithium easy to polarize other molecules or ions, but not itself. This will affect the stability of it and its compounds.
Due to the most negative electrode potential, lithium is the most active metal among known elements (including radioactive elements).
In August 2018, a team led by researchers from the National Astronomical Observatory of the Chinese Academy of Sciences found a strange celestial body relying on LAMOST. Its lithium content is about 3000 times that of similar celestial bodies, and it is the star with the highest lithium abundance known to mankind
