Atomic Numbers

Some articles on atomic numbers, atomic, number:

Otto Hahn - Biography - Career - The Discovery of Nuclear Fission
... Until 1938, it was believed that the elements with atomic numbers greater than 92 (known as transuranium elements) arise when uranium atoms are bombarded with neutrons ... The idea that heavy atomic nuclei could break down into lighter elements was regarded as totally inadmissible ... and 1938, Hahn, Meitner, and Strassmann found a great number of radioactive transmutation products, all of which they regarded as transuranic ...
Abundance Of The Chemical Elements - Abundance of Elements in The Universe - Elemental Abundance and Nuclear Binding Energy
... Roughly speaking, the relative stability of various atomic isotopes has exerted a strong influence on the relative abundance of elements formed in the Big Bang, and during the development of the ... between relative abundance and scarcity of adjacent atomic numbers in the elemental abundance curve, and a similar pattern of energy levels in the nuclear binding energy ... is caused by the higher relative binding energy (corresponding to relative stability) of even atomic numbers compared to odd atomic numbers, and is explained by the Pauli ...
Henry Moseley - Contribution To Physics and Chemistry
... mathematical relationship between the wavelengths of the X-rays produced and the atomic numbers of the metals that were used as the targets in X-ray tubes ... Before Moseley's discovery, the atomic numbers (or elemental number) of an element had been thought of as a semi-arbitrary sequential number, based on ... cobalt and nickel had been assigned the atomic numbers 27 and 28, respectively, based on their known chemical and physical properties, even though they have nearly the same ...
Chemical Element - Description - Properties - Occurrence and Origin On Earth
... by their origin on Earth, with the first 98 considered to be naturally occurring, while those with atomic numbers beyond 98 have only been produced artificially as the synthetic ... Elements with atomic numbers 1 through 40 are all stable, while those with atomic numbers 41 through 82 (except technetium and promethium) are metastable ... Elements with atomic numbers 83 through 98 are unstable to the point that their radioactive decay can be detected ...
Transuranium Element - Overview
... Of the elements with atomic numbers 1 to 92, all can be found in nature, having stable (such as hydrogen), or very long half-life (such as polonium) isotopes, or are created as common products ... All of the elements with higher atomic numbers, however, have been first discovered in the laboratory, with neptunium, plutonium, americium, curium, berkelium and californium later also discovered in nature ... uranium-rich rock, and small amounts are produced during atmospheric tests of atomic weapons ...

Famous quotes containing the words numbers and/or atomic:

    The forward Youth that would appear
    Must now forsake his Muses dear,
    Nor in the Shadows sing
    His Numbers languishing.
    Andrew Marvell (1621–1678)

    When you see something that is technically sweet, you go ahead and do it and you argue about what to do about it only after you have had your technical success. That is the way it was with the atomic bomb.
    J. Robert Oppenheimer (1904–1967)