tennessine

(tĕn`əsēn), artificially produced radioactive chemical elementelement,
in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means of a chemical reaction, but no further simplification can be achieved.
..... Click the link for more information. ; symbol Ts; at. no. 117; mass number of most stable isotopeisotope
, in chemistry and physics, one of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of isotope was introduced by F.
..... Click the link for more information. 294; m.p., b.p., sp. gr., and valence unknown. Tennessine is a member of Group 17 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. , the halogenshalogen
[Gr.,=salt-bearing], any of the chemically active elements found in Group 17 of the periodic table; the name applies especially to fluorine (symbol F), chlorine (Cl), bromine (Br), and iodine (I).
..... Click the link for more information. , and may have properties similar to astatineastatine
[Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302&degC; (estimated); b.p. 337&degC; (estimated); density unknown; valence believed to be +1, +3, +5, or +7.
..... Click the link for more information. .

In 2010 scientists from the Joint Institute for Nuclear Research in Dubna, Russia, announced that they had bombarded (2009) berkelium-249 atoms with calcium-48 ions to create two forms of tennessine. The Ts-294 isotope, with a half-life of 78 milliseconds, decayed through alpha-particle emission into dubnium (element 105), while the lighter Ts-293, with a half-life of 14 milliseconds, decayed down to roentgenium (element 111). The Russian researchers collaborated with American scientists at Vanderbilt Univ. and the Oak Ridge National Laboratory, which produced the berkelium used in the experiment. In 2015 the International Union of Pure and Applied Chemistry (IUPAC) confirmed the discovery. In 2016 the element's discoverers proposed the name tennessine, to honor the home state of the American collaborators, and the name was approved by IUPAC later that year.

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. .

单词	tennessine
释义	tennessine ten·nes·sine T5115450 (tĕn′ə-sēn′) n. Symbol Ts An artificially produced radioactive element with atomic number 117 whose most stable isotopes have a mass number of 293 and 294, with the lighter, more stable isotope having a half-life of less than 90 milliseconds. [Tenness(ee) + -ine (so called because members of the team involved in its synthesis were associated with the Oak Ridge National Laboratory; the University of Tennessee, Knoxville; and Vanderbilt University, all in Tennessee).] tennessine tennessine (tĕn`əsēn), artificially produced radioactive chemical elementelement, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means of a chemical reaction, but no further simplification can be achieved. ..... Click the link for more information. ; symbol Ts; at. no. 117; mass number of most stable isotopeisotope , in chemistry and physics, one of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of isotope was introduced by F. ..... Click the link for more information. 294; m.p., b.p., sp. gr., and valence unknown. Tennessine is a member of Group 17 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. , the halogenshalogen [Gr.,=salt-bearing], any of the chemically active elements found in Group 17 of the periodic table; the name applies especially to fluorine (symbol F), chlorine (Cl), bromine (Br), and iodine (I). ..... Click the link for more information. , and may have properties similar to astatineastatine [Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302&degC; (estimated); b.p. 337&degC; (estimated); density unknown; valence believed to be +1, +3, +5, or +7. ..... Click the link for more information. . In 2010 scientists from the Joint Institute for Nuclear Research in Dubna, Russia, announced that they had bombarded (2009) berkelium-249 atoms with calcium-48 ions to create two forms of tennessine. The Ts-294 isotope, with a half-life of 78 milliseconds, decayed through alpha-particle emission into dubnium (element 105), while the lighter Ts-293, with a half-life of 14 milliseconds, decayed down to roentgenium (element 111). The Russian researchers collaborated with American scientists at Vanderbilt Univ. and the Oak Ridge National Laboratory, which produced the berkelium used in the experiment. In 2015 the International Union of Pure and Applied Chemistry (IUPAC) confirmed the discovery. In 2016 the element's discoverers proposed the name tennessine, to honor the home state of the American collaborators, and the name was approved by IUPAC later that year. 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. .
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tennessine

ten·nes·sine

tennessine

tennessine