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Side left and top right views of the graphite intercalation compound KC 8.

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لز وطنی

On July 23, , a team of Japanese scientists at RIKEN bombarded a target of bismuth with accelerated nuclei of zinc and detected a single atom of the isotope ununtrium They published their results on September 28, [5]. Also press release in Japanese. Ununtrium has no stable or naturally-occurring isotopes. Several radioactive isotopes have been synthesized in the laboratory, either by fusing two atoms or by observing the decay of heavier elements. Six different isotopes of ununtrium have been reported with atomic masses and —; they all decay through alpha decay. The stability of nuclei quickly decreases with the increase in atomic number after curium , element 96, whose half-life is over ten thousand times longer than that of any subsequent element. All isotopes with an atomic number above undergo radioactive decay with half-lives of less than 30 hours: this is because of the ever-increasing Coulomb repulsion of protons, so that the strong nuclear force cannot hold the nucleus together against spontaneous fission for long. Calculations suggest that in the absence of other stabilising factors, elements with more than protons should not exist. Researchers in the s suggested that the closed nuclear shells around protons and neutrons should counteract this instability, and create an " island of stability " containing nuclides with half-lives reaching thousands or millions of years.

The Open University.

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لز وطنی

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Revolution in lamps: A chronicle of 50 years of progress. Bibcode : STAdM Journal of Physical Chemistry. Chemical composition of everyday products. Some spectroscopic discoveries". Sulfur 16 S. Nature's Building Blocks. Kirk-Othmer encyclopedia of chemical technology. No data 24 hours. Mentions by GEO. Dimerization and Reduction of Rhodocene".

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Washington, D. Gold 79 Au. The isotope Nh, as well as the unconfirmed Nh and Nh, have also been reported to have half-lives of over a second. Revolution in lamps: A chronicle of 50 years of progress. Dinnebier, R. Wiley-Interscience, New York. Preparation and crystal structure of a compound which contains the cryptated sodium cation and the sodium anion". Inorganic Chemistry of Main Group Elements. Oxford: Oxford University Press. Emery, N. Academic Press. Nuclear Technology Publishing.