The spectral lines of promethium have also been observed in some stars. Promethium can be produced artificially by the bombardment of neodymium with neutrons to form neodymium, which decays into promethium and a beta particle:. The elements following uranium on the periodic table are only produced artificially, and are known as the transuranium or transuranic elements. These elements may have existed on Earth early in its history, but like technetium, would have long ago decayed into more stable elements.
These elements can be produced by several processes:. It has been theorized that the elements following element , which would be in the p-block region of the periodic table, might possibly be more stable than those of the last row of the transition metals ; however, there is not as yet enough data to confirm whether this so-called "island of stability" actually exists.
In any case, since only a few million or at best billion of the heaviest of these atoms can be produced at any one time, it is rather doubtful that any major construction projects will use any of these elements as building materials! The table below lists the longest-lived isotopes of the transuranium elements, with their half-lives, discoverers, and method of production.
Method of Production Logest-lived Isotope. Seaborg bombardment of Cf with O 2. Oxford, Clarendon Press, ; and David L. Heiserman, Exploring Chemical Elements and their Compounds. I know sulphur has 16 of each. However, it might be an isotope of. Write the correct symbol in standard form for the isotope of platinum that contains neutrons.
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What isotope of the new element is produced by this reaction? Which statement about subatomic particles is NOT true? Protons and electrons have opposite charges. Unlike protons and electrons, neutrons have no charge. Protons and. A Geiger counter measures radiation indirectly by measuring flashes of light electrons released by ionization speaker static curies answer: electrons released by ionization 2. Reactor control rods are made of a substance that.
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Plz Help! Chemistry Write the correct symbol in standard form for the isotope of platinum that contains neutrons.
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