Americium Definition
ămə-rĭshē-əm
noun
A white metallic transuranic element of the actinide series, having isotopes with mass numbers from 232 to 247. Am-241 and Am-243 are the isotopes with the longest half-lifes (432.2 years and 7,370 years, respectively), and are alpha-ray and gamma-ray emitters used as radiation sources in research, radiography, and smoke alarms. Atomic number 95; melting point 1176°C; boiling point 2011°C; specific gravity 12; valence 3, 4, 5, 6.
American Heritage
A radioactive, metallic chemical element, one of the actinides, produced by the beta decay of an isotope of plutonium: symbol, Am; at. no. 95
Webster's New World
The chemical element (symbol Am) with an atomic number of 95.
Wiktionary
Synonyms:
- atomic number 95
- am
Origin of Americium
-
From Americ(as) + -ium, by analogy with europium.
From Wiktionary
After America
From American Heritage Dictionary of the English Language, 5th Edition
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