mendelevium

alternative mendeleevium · alternative mendeleyevium

1. uncountablechemistryA radioactive metallic transuranic chemical element (symbol Md) with atomic number 101, which is artificially produced in a particle accelerator.

   Seven new elements were discovered with the 60-inch cyclotron: 85 (astatine), 93 (neptunium), 94 (plutonium), 96 (curium), 97 (berkelium), 98 (californium), and 101 (mendeleevium).

   1963 January, “Physical Research: New Physical Research Facilities”, in Major Activities in the Atomic Energy Programs: January–December 1962, United States Atomic Energy Commission, United States Government Printing Office, →OCLC, part 4 (Other Major Programs), page 336

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   Mendelevium, the heaviest and rarest form of matter known, has been produced in the University of California's cyclotron. Identity based on only 17 atoms of new element [subtitle]. […] Mendelevium is intensely radioactive, decaying by spontaneous fission. Its half-life is between a half hour and three hours. It has chemical properties similar to those of thulium, element 69, a rare earth.

   1955 May 14, “Element 101 Discovered”, in Science News Letter, volume 67, number 20, Washington, D.C.: Science Service, →ISSN, →OCLC, page 307, column 1

   There's sulfur, californium, and fermium, berkelium, / And also mendelevium, einsteinium, nobelium, / And argon, krypton, neon, radon, xenon, zinc, and rhodium, / And chlorine, carbon, cobalt, copper, tungsten, tin, and sodium.

   1959 (date composed), Tom Lehrer, “The Elements”, in Too Many Songs, New York, N.Y.: Pantheon Books, published 1981, →ISBN, part 2 (From An Evening Wasted with Tom Lehrer), page 151, column 2

   In the expert hands of Enrico Fermi, beginning with 1934, neutron bombardment produced new atomic miracles. In 1940, Fermi created neptunium (Z = 93), the first artificial, 'trans-uranic', element. Others, also unstable, soon followed, among them fermium (Z = 100) and mendeleyevium (Z = 101).

   1987, R. S. Baghavan, “The Transformation from Quantity to Quality and Quality to Quantity”, in An Introduction to the Philosophy of Marxism, 2nd edition, part I, London: Socialist Platform, →ISBN, page 115

   [Glenn Theodore] Seaborg would be the principal co-discoverer of ten elements on the periodic table: plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, and element 106.

   2025 July, Iain MacGregor, “Notes [to chapter 6]”, in The Hiroshima Men: The Quest to Build the Atomic Bomb, and the Fateful Decision to Use It, 1st Scribner hardcover edition, New York, N.Y.: Scribner, →ISBN, endnote 6, page 381

   Synonyms: Md, Mv, unnilunium

   1. countablechemistryAn atom of this element.

      Synonyms: Md, Mv, unnilunium