ununpentium

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Related to Elerium: Element 115

ununpentium,

artificially produced radioactive chemical element; symbol Uup; at. no. 115; mass number of most stable isotope 288; m.p., b.p., sp. gr., and valence unknown. Situated in Group 15 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 bismuthbismuth
[Ger. Weisse Masse=white mass], metallic chemical element; symbol Bi; at. no. 83; at. wt. 208.98040; m.p. 271.3°C;; b.p. about 1,560°C;; sp. gr. 9.75 at 20°C;; valence +3 or +5.
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 and antimonyantimony
[Lat. antimoneum], semimetallic chemical element; symbol Sb [Lat. stibium,=a mark]; at. no. 51; at. wt. 121.760; m.p. 630.74°C;; b.p. 1,750°C;; sp. gr. (metallic form) 6.69 at 20°C;; valence 0, +3, −3, or +5.
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.

In a 27-day experiment in 2003, scientists from the Joint Institute for Nuclear Research in Dubna, Russia, and Lawrence Livermore National Laboratory in California collaborated in the discovery of ununpentium. They bombarded atoms of americiumamericium
, artificially produced radioactive chemical element; symbol Am; at. no. 95; mass no. of most stable isotope 243; m.p. about 1,175°C;; b.p. about 2,600°C;; sp. gr. 13.67 at 20°C;; valence +2, +3, +4, +5, or +6.
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-243 with ions of calciumcalcium
[Lat.,=lime], metallic chemical element; symbol Ca; at. no. 20; at. wt. 40.078; m.p. about 839°C;; b.p. 1,484°C;; sp. gr. 1.55 at 20°C;; valence +2. Calcium is a malleable, ductile, silver-white, relatively soft metal with face-centered, cubic crystalline
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-48. Among the products of the bombardment were one atom of ununpentium-287 and three atoms of ununpentium-288, each of which in less than one tenth of a second decayed into atoms of ununtriumununtrium,
artificially produced radioactive chemical element; symbol Uut; at. no. 113; mass number of most stable isotope 284; m.p., b.p., sp. gr., and valence unknown.
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 by emitting an alpha particle. Ununpentium-289 and ununpentium-290 have also been produced (2009) at Dubna by alpha-particle decay of ununseptiumununseptium
, artificially produced radioactive chemical element; symbol Uus; at. no. 117; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown.
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. Swedish researchers from Lund Univ., in a 2013 experiment at the GSI Helmholtz Center for Heavy Ion Research, Darmstadt, Germany, largely replicated the 2003 results, producing ununpentium-288. The Russian-American discovery of the element was confirmed by the International Union of Pure and Applied Chemistry (IUPAC) in 2015. No name has yet been formally adopted for element 115, which is therefore called ununpentium, from the Latin roots un for one and pent for five, under a convention for neutral temporary names proposed by IUPAC in 1980, but the name moscovium, to honor the Moscow region (home of the Dubna facility), was suggested by the element's discoverers in 2016. The most stable isotope of ununpentium, Uup-289, has a half-life of approximately 200 msec.

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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.

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