Scandium is a chemical element with the symbol Sc and atomic number 21. It is a soft, silvery-white metal that belongs to the transition metals group in the periodic table. Scandium is relatively rare in the Earth's crust and is often found in minerals such as thortveitite and gadolinite. This element is known for its lightweight properties and is used in various applications, including aerospace components and sports equipment. Scandium alloys, particularly with aluminum, enhance strength and reduce weight, making them valuable in industries that prioritize performance and efficiency.