Bismuth is the last transition metal with chemical symbol Bi and atomic number 83. It is a solid and silvery-grey metal at standard pressure and temperature, it is very strong to cut but you can break easily with a hammer. Bismuth is mostly used in low-melting alloys. In pure form it can grow beautiful crystals. It has long been thought to be the last stable element, but in 2003 its radioactivity was discovered. The natural isotope 209Bi has an extremely long half life (19 quintillion years) and therefore is harmless even in large quantities.