copernicium


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Related to copernicium: flerovium, livermorium, Ununtrium

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
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, 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.
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, 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.
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, 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.
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.

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 resultant 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.
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 of 280 msec. Copernicium was initially called ununbium, from the Latin roots un for one and bi for two, under a convention for neutral temporary names proposed by the International Union of Pure and Applied Chemistry (IUPAC) in 1980. 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.
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, was proposed for the element by its discoverers, and 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.
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; 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.
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; 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.
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.

References in periodicals archive ?
In February, the IUPAC finally granted the name copernicium to element 112, which was first reported by Hofmann's group in 1996 (SN: 3/27/10, p.
Copernicium is 277 times heavier than hydrogen, making it the heaviest element officially recognized by IUPAC.
Element 112, a "superheavy" element with an atomic mass of 278, is officially named copernicium, the International Union of Pure and Applied Chemistry announced February 19.
Scientists hope that copernicium (pronounced koh-pur-NEE-see-um) is a stepping stone toward the predicted "island of stability," a region of the periodic table where researchers expect to find superheavy elements that last longer than a few seconds and might be exploited for purposes still unknown.
A team led by Sigurd Hofmann of the Center for Heavy Ion Research in Darmstadt, Germany, created copernicium, symbol Cn, in 1996 by bombarding a lead target with zinc.
Sitting below zinc, cadmium and mercury in the periodic table, copernicium may behave similarly to these metals.