| 释义 |
moscovium
mos·co·vi·um M5466450 (mŏ-skō′vē-əm) n. Symbol Mc An artificially produced radioactive element with atomic number 115 whose most stable isotope has a mass number of 289 and a half-life of 220 milliseconds.
[New Latin Moscovia, Moscow, Muscovy (probably from Old Russian Moskovĭ, accusative of *Mosky, Moscow, source of Modern Russian Moskva, Moscow) + -ium (so called because it was first synthesized at the Joint Institute for Nuclear Research in Dubna, in the Moscow region).] moscovium
moscovium (mŏskō`vēəm), artificially produced radioactive chemical element; symbol Mc; 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
..... Click the link for more information. , 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.
..... Click the link for more information. 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.
..... 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 moscovium. 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.
..... Click the link for more information. -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
..... Click the link for more information. -48. Among the products of the bombardment were one atom of moscovium-287 and three atoms of moscovium-288, each of which in less than one tenth of a second decayed into atoms of nihoniumnihonium
, artificially produced radioactive chemical element; symbol Nh; 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, it is expected to have properties similar to those of thallium and
..... Click the link for more information. by emitting an alpha particle. Moscovium-289 and moscovium-290 have also been produced (2009) at Dubna by alpha-particle decay of tennessinetennessine
, artificially produced radioactive chemical element; symbol Ts; at. no. 117; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown.
..... Click the link for more information. . 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 moscovium-288. The Russian-American discovery of the element was confirmed by the International Union of Pure and Applied Chemistry (IUPAC) in 2015. The name moscovium, in honor of the Moscow region (home of the Dubna facility), was suggested by the element's discoverers in 2016 and approved by IUPAC later that year. The most stable isotope of moscovium, Mc-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.
..... 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. . |