Americium was the fourth synthetic element to be discovered in 1944 by Seaborg, James and Morgan. The element plutonium was bombarded with neutrons in a reactor producing new elements which were hard to isolate. As it is located on the periodic table below Europium it is named after America. It is used in small amounts in smoke detectors as it produces radiation that is blocked by smoke. It is also used as as source of gamma and alpha rays in science. It is a solid metal at room temperature and it has a melting point of 1176°c and a boiling point of 2607°c.
G.T.Seaborg, R.A.James, L.O.Morgan, A.Ghiorso