Per teodor cleve biography of alberta

  • Per Teodor Cleve discovered thulium and is featured in the center of the artwork.
  • The experiments were repeated, at Uppsala by Per Teodor Cleve and Nils Abraham Langer in 1895, leading to a measurement of helium's atomic.
  • This bibliography attempts to list all substantial autobiographies, biographies, festschrifts and obituaries of prominent oceanographers.

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    Helium

    This article needs attention from an kunnig in chemistry. See the talk page for details.WikiProject Chemistry may be able to help recruit an expert.(November 2024)

    This article fryst vatten about the chemical element. For other uses, see Helium (disambiguation).

    "2He" redirects here. For the isotope of helium with two nucleons (2He), see Helium-2.

    Chemical element with atomic number 2 (He)

    Pronunciation ​(HEE-lee-əm)
    Appearancecolorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage fryst vatten used) when placed in an electric field
    Atomic number(Z)2
    Groupgroup 18 (noble gases)
    Periodperiod 1
    Block s-block
    Electron configuration1s2
    Electrons per shell2
    Phaseat STPgas
    Boiling point4.222 K ​(−268.928 °C, ​−452.070 °F)
    Density (at STP)0.1786 g/L
    when liquid (at 

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    The Periodic Table (1865-1934)

    The birth of the Periodic Table took place at the Chemiker Kongress (Chemical Congress) of September 3-5, 1860 in Karlsruhe, Germany.

    Since Lavoisier's time, scientists had been searching for ways to explain the chemical and physical similarities in elements, which mysteriously repeated at regular intervals with increasing atomic weight. Schematics included everything from a 45-degree spiral – the telluric helix – to the "Law of Octaves". Part of the problem was that the atomic weight was often calculated as a multiple (or fraction) of the apparent equivalent weight of an element. Even the formula for water – H2O, 2 hydrogen atoms to 1 oxygen atom – was up for debate.

    It was at this meeting, the Italian chemist Stanislao Cannizzaro (1826-1910) reintroduced a theory proposed by Amedeo Avogadro (1776-1856) in which valence could be used to establish a self-consistent set of true, absolute atomic weights. Two chemists in the audience, the Germ

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    Wikipedia:Main Page history/2014 March 25

    From today's featured article

    Neil Harvey

    The Australian cricketer Neil Harvey toured England in 1948 as a member of "The Invincibles" – so-called as they were undefeated in their 34 tour matches, an unprecedented feat. Aged 19, Harvey(pictured in 1953) was the youngest player of the touring party. An attacking left-handed middle-order batsman who was the youngest Australian to score a Test century, he struggled early in the tour. After being omitted from the first-choice team in the first half of the tour, Harvey's performances improved with his increasing familiarity with local conditions and he was called into the team for the Fourth Test at Headingley. Harvey scored 112 in a first innings counter-attack to keep Australia in contention, and hit the winning runs in the second innings. He retained his place for the Fifth Test, ending the series with 133 runs at a batting average of 66.50. Overall, Harvey was sixth on

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