americium
n 1: a radioactive transuranic metallic element; discovered by
bombarding uranium with helium atoms [syn: {americium},
{Am}, {atomic number 95}]
americium
Symbol: Am
Atomic number: 95
Atomic weight: (243)
Radioactive metallic transuranic element, belongs to the actinoids. Ten
known isotopes. Am-243 is the most stable isotope, with a half-life of
7.95*10^3 years. Discovered by Glenn T. Seaborg and associates in 1945,
it
was obtained by bombarding {uranium}-238 with alpha particles.