americiumn.

Brit.

/ˌaməˈrɪsɪəm/,

/ˌaməˈrɪʃɪəm/, U.S.

/ˌæməˈrɪsiəm/,

/ˌæməˈrɪʃiəm/

Origin: From a proper name, combined with English elements. Etymons: proper name America , -ium suffix.

Etymology: < Americ- (in the name of America: see America n.) + -ium suffix, after europium n.Compare:1948 G. T. Seaborg et al. New Elem. Americium (U.S. Atomic Energy Comm.) 1 The name americium (after the Americas) and the symbol Am are suggested for the element on the basis of its position as the sixth member of an actinide rare-earth series, analogous to europium, Eu, of the lanthanide series.

Chemistry.

A metallic radioactive transuranic element of the actinide series, atomic number 95, which is produced artificially by the bombardment of uranium with high-energy helium nuclei. Symbol Am. Discovered by G. T. Seaborg, R. A. James and L. O. Morgan at the Metallurgical Laboratory of the Manhattan Project (University of Chicago), in 1944–5.The longest-lived isotope (americium-243) has a half life of 7370 years.

ΘΚΠ

the world > matter > chemistry > elements and compounds > metals > specific elements > americium > [noun]

Am1946

americium1946

1946 N.Y. Times 11 Apr. 15/4 Elements 95 and 96, the two newest trans-uranium elements to be created, have been named, respectively, Americium, after the Americas, and curium.

1946 Times 20 Nov. 3/3 The isolation in a pure form of americium, one of four newly discovered elements in the release of atomic energy, was announced last night before the American Chemical Society.

1989 C. Caufield Multiple Exposures (1990) xx. 209 As long as the americium, whose half life is 432 years, stays inside the [smoke] detector, there is no cause for concern.

2003 B. Burton Nucl. Power, Pollution & Politics i. 5 ‘Spent fuel’ can be reprocessed chemically to discard fission products and elements such as americium.

This entry has been updated (OED Third Edition, June 2008; most recently modified version published online December 2021).

单词	americium
释义	americiumn. Brit. /ˌaməˈrɪsɪəm/, /ˌaməˈrɪʃɪəm/, U.S. /ˌæməˈrɪsiəm/, /ˌæməˈrɪʃiəm/ Origin: From a proper name, combined with English elements. Etymons: proper name America , -ium suffix. Etymology: < Americ- (in the name of America: see America n.) + -ium suffix, after europium n.Compare:1948 G. T. Seaborg et al. New Elem. Americium (U.S. Atomic Energy Comm.) 1 The name americium (after the Americas) and the symbol Am are suggested for the element on the basis of its position as the sixth member of an actinide rare-earth series, analogous to europium, Eu, of the lanthanide series. Chemistry. A metallic radioactive transuranic element of the actinide series, atomic number 95, which is produced artificially by the bombardment of uranium with high-energy helium nuclei. Symbol Am. Discovered by G. T. Seaborg, R. A. James and L. O. Morgan at the Metallurgical Laboratory of the Manhattan Project (University of Chicago), in 1944–5.The longest-lived isotope (americium-243) has a half life of 7370 years. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > americium > [noun] Am1946 americium1946 1946 N.Y. Times 11 Apr. 15/4 Elements 95 and 96, the two newest trans-uranium elements to be created, have been named, respectively, Americium, after the Americas, and curium. 1946 Times 20 Nov. 3/3 The isolation in a pure form of americium, one of four newly discovered elements in the release of atomic energy, was announced last night before the American Chemical Society. 1989 C. Caufield Multiple Exposures (1990) xx. 209 As long as the americium, whose half life is 432 years, stays inside the [smoke] detector, there is no cause for concern. 2003 B. Burton Nucl. Power, Pollution & Politics i. 5 ‘Spent fuel’ can be reprocessed chemically to discard fission products and elements such as americium. This entry has been updated (OED Third Edition, June 2008; most recently modified version published online December 2021). < n.1946
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