Scandium has 21 electrons, as indicated by the element's atomic number. Scandium also has 21 protons and 24 neutrons. Its atomic symbol is Sc.
Scandium has four energy levels. Two electrons are contained in its first energy level, eight are contained in its second, nine are contained in its third and two are contained in its outer energy level.
Scandium was discovered in 1879 by Lars Fredrik Nilson, a chemist from Sweden. The element was named after Scandinavia. Scandium is sometimes used in the aerospace industry because it is a soft, light metal. Due to the high cost of isolating pure metallic scandium, it does not have a general use.