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Chemical element - Wikipedia, the free encyclopedia
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Los Alamos National Laboratory's Chemistry Division Presents: A Resource for Elementary, Middle School, and High School Students ... 1; IA; 1A ... 18; VIIIA; 8A...
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Award winning periodic table, with user-friendly element data and facts. Cool, online chemistry videos, dictionary, tools and forum. ... Mendeleev found he could arrange the 65 elements that were then known in a grid or table so that each element had:
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Interactive Web 2.0 periodic table with dynamic layouts showing names, electrons, oxidation, trend visualization, orbitals, isotopes, search. Full descriptions. ... Periodic Table of Elements ... For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses...
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There are over 100 chemical elements; however some are only found inside nuclear reactors, these have very short half-lives. ... Columns of elements in the periodic table are called Groups. Elements in the same group have similar chemical properties.
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