Rikenium definition of Rikenium in the Free Online Encyclopedia.

ununtrium, 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. Situated in Group 13 of the periodic table periodic 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
..... Click the link for more information. , it is expected to have properties similar to those of thallium thallium (thăl`ēəm), metallic chemical element; symbol Tl; at. no. 81; at. wt. 204.383; m.p. 303.5°C;; b.p.
..... Click the link for more information. and indium indium (ĭn`dēəm), a metallic chemical element; symbol In; at. no. 49; at. wt. 114.82; m.p. 156.6°C;; b.p.
..... Click the link for more information. .

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 ununtrium. They bombarded atoms of americium americium (ămərĭ`shēəm), artificially produced radioactive chemical element; symbol Am; at. no. 95; mass no.
..... Click the link for more information. -243 with ions of calcium calcium (kăl`sēəm) [Lat.,=lime], metallic chemical element; symbol Ca; at. no. 20; at. wt. 40.08; m.p. about 839°C;; b.p.
..... Click the link for more information. -48. Among the products of the bombardment were four atoms of ununpentium 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.
..... Click the link for more information. (element 115), which in less than one tenth of a second decayed into atoms of ununtrium by emitting an alpha particle. Two isotopes of ununtrium were identified, the longer-lived (Uut-284) having a half-life of about 48 millisecondsc, and the other (Uut-283) a half-life of about 46.6 milliseconds. No name has yet been adopted for element 113, which is therefore called ununtrium, from the Latin roots un for one and tri for three, under a convention for neutral temporary names proposed by the International Union of Pure and Applied Chemistry (IUPAC) in 1980.

See also synthetic elements synthetic 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 elements transactinide elements (trăns'ăk`tənīd'), in chemistry, elements with atomic numbers greater than that of lawrencium (at.
..... Click the link for more information. ; transuranium elements transuranium 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. .

ununtrium (redirected from Rikenium)

ununtrium
(redirected from Rikenium)