Americium
a transuranic element, one of the products of high-energy helium bombardment of uranium and plutonium. symbol: am; atomic number: 95.
noun
a white metallic transuranic element artificially produced from plutonium. it is used as an alpha-particle source. symbol: am; atomic no: 95; half-life of most stable isotope, 243am: 7.4 × 10³ years; valency: 2,3,4,5, or 6; relative density: 13.67; melting pt: 1176°c; boiling pt: 2607°c (est)
americium am·er·i·ci·um (ām’ə-rĭsh’ē-əm)
n.
symbol am
a white metallic synthetic element of the actinide series; its longest-lived isotopes, am 241 and am 243, are used as radiation sources in research. atomic number 95; specific gravity 13.7; valence 2, 3, 4, 5, 6.
americium
(ām’ə-rĭsh’ē-əm)
symbol am a synthetic, silvery-white, radioactive metallic element of the actinide series that is produced artificially by bombarding plutonium with neutrons. americium is used as a source of alpha particles for smoke detectors and gamma rays for industrial gauges. its most stable isotope has a half-life of 7,950 years. atomic number 95; specific gravity 11.7; valence 3, 4, 5, 6. see periodic table.
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- Americus vespucius
amerigo [uh-mer-i-goh;; italian ah-me-ree-gaw] /əˈmɛr ɪˌgoʊ;; italian ˌɑ mɛˈri gɔ/ (show ipa), (americus vespucius) 1451–1512, italian merchant, adventurer, and explorer after whom america was named. historical examples a few of them had seen the vessels of americus vespucius and cabral. martin rattler r.m. ballantyne do you think that americus vespucius deserved so great an honor? […]
- Amerigo vespucci
. amerigo [uh-mer-i-goh;; italian ah-me-ree-gaw] /əˈmɛr ɪˌgoʊ;; italian ˌɑ mɛˈri gɔ/ (show ipa), (americus vespucius) 1451–1512, italian merchant, adventurer, and explorer after whom america was named. historical examples the claims of amerigo vespucci to a previous discovery are doubtful. encyclopaedia britannica, 11th edition, volume 10, slice 2 various the pilot of this expedition was an […]
- Ameristic
not divided into parts; having no meristem.
- Amersa
amersa -ssociation for medical education and research in substance abuse
- Amersfoort
a city in the central netherlands. historical examples in the night the allies retreated to amersfoort, leaving 300 sick behind them. the every day book of history and chronology joel munsell animals of this region had never seen a town larger than amersfoort. the chauffeur and the chaperon c. n. williamson after a stiff climb […]