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copernicium
co·per·ni·ci·um C5655950 (kō′pər-nē′sē-əm, -shē-)n. Symbol Cn An artificially produced radioactive element with atomic number 112 that has only been produced in trace amounts and has nine observed isotopes with mass numbers ranging from 277 to 285. The most stable isotope has a mass number of 285 and a half-life of about 34 seconds.
[After Nicolaus Copernicus.]copernicium (ˌkəʊpəˈnɪsɪəm) n (Elements & Compounds) a highly radioactive element that is produced synthetically. Symbol: Cn; atomic no: 112; atomic wt: 285[C21: named after Nicolaus Copernicus ]copernicium
copernicium, artificially produced radioactive chemical element; symbol Cn; at. no. 112; mass number of most stable isotope 285; m.p., b.p., sp. gr., and valence unknown. Situated in Group 12 of the periodic tableperiodic table,
chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled
..... Click the link for more information. , it is expected to have properties similar to those of zinczinc,
metallic chemical element; symbol Zn; at. no. 30; at. wt. 65.38; m.p. 419.58°C;; b.p. 907°C;; sp. gr. 7.133 at 25°C;; valence +2. Zinc is a lustrous bluish-white metal. It is found in Group 12 of the periodic table.
..... Click the link for more information. , cadmiumcadmium
[from cadmia, Lat. for calamine, with which cadmium is found associated], metallic chemical element; symbol Cd; at. no. 48; at. wt. 112.411; m.p. 321°C;; b.p. 765°C;; sp. gr. 8.65 at 20°C;; valence +2.
..... Click the link for more information. , and mercurymercury
or quicksilver
[from the Roman god Mercury], metallic chemical element; symbol Hg [Lat. hydrargyrum=liquid silver]; at. no. 80; at. wt. 200.59; m.p. −38.842°C;; b.p. 356.58°C;; sp. gr. 13.55 at 20°C;; valence +1 or +2.
..... Click the link for more information. . In 1996 an international research team led by Peter Armbruster and Sigurd Hofmann at the Institute for Heavy Ion Research at Darmstadt, Germany bombarded lead-208 atoms with high-energy zinc-70 ions. In a two-week experiment, one of the resulting atoms was unambiguously identified as an isotope of element 112 with mass number 277 and a half-lifehalf-life,
measure of the average lifetime of a radioactive substance (see radioactivity) or an unstable subatomic particle. One half-life is the time required for one half of any given quantity of the substance to decay.
..... Click the link for more information. of 280 msec. In 2009 the name copernicium, for CopernicusCopernicus, Nicholas
, Pol. Mikotaj Kopérnik, 1473–1543, Polish astronomer. After studying astronomy at the Univ. of Kraków, he spent a number of years in Italy studying various subjects, including medicine and canon law. He lectured c.
..... Click the link for more information. , was proposed for the element by its discoverers, and International Union of Pure and Applied Chemistry (IUPAC) approved the name in 2010. The most stable isotope, copernicium-285, has a half-life of approximately 29 sec. See also synthetic elementssynthetic elements,
in chemistry, radioactive elements that were not discovered occurring in nature but as artificially produced isotopes. They are technetium (at. no. 43), which was the first element to be synthesized, promethium (at. no. 61), astatine (at. no.
..... Click the link for more information. ; transactinide elementstransactinide elements
, in chemistry, elements with atomic numbers greater than that of lawrencium (at. no. 103), the last member of the actinide series. See transuranium elements.
..... Click the link for more information. ; transuranium elementstransuranium elements,
in chemistry, radioactive elements with atomic numbers greater than that of uranium (at. no. 92). All the transuranium elements of the actinide series were discovered as synthetic radioactive isotopes at the Univ.
..... Click the link for more information. . |