Adjacent Words

americium definitions

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WordNet (r) 3.0 (2005)

n
1: a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms [syn: americium, Am, atomic number 95]

Merriam Webster's

noun Etymology: New Latin, from America + New Latin -ium Date: 1946 a radioactive metallic element produced artificially by bombarding plutonium with high-energy neutrons — see element table

Dictionary of the Elements

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.

Oxford Reference Dictionary

n. Chem. an artificially made transuranic radioactive metallic element. Usage: Symb.: Am. Etymology: America (where first made) + -IUM