The lanthanide elements, also known as the rare-earth elements, are a series of metallic chemical elements that have atomic numbers from 57 to 71.
These elements are soft, silvery-white metals that are highly reactive and easily oxidized. They have a high melting and boiling point, and are often used in alloys, magnets, and other industrial applications.
Also, lanthanide elements are important in many modern technologies, such as green energy technologies and they are also used in the production of electronics, lasers, and medical imaging equipment.