Group Three refers to a category of elements in the periodic table, specifically the group that includes the chemical elements Scandium, Yttrium, and the lanthanides and actinides. These elements are characterized by having three electrons in their outermost shell, which influences their chemical properties and reactivity. They are often metals and are known for their high melting points and strength. In addition to their unique properties, Group Three elements are commonly used in various applications. For example, Yttrium is utilized in electronics and superconductors, while Scandium is used in aerospace components due to its lightweight and strong characteristics.