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Scandium (named for Scandinavia where Scandium ores can be found) has the symbol Sc and atomic number of 21, meaning the nucleus contains 21 protons. Scandium has an atomic weight of 44.955912, with one stable isotope and 13 radioactive isotopes. It is a rare silvery metal, so is considered to be a rare earth element (REE). Although it is within the d-block in the periodic table, it is not considered a transition metal.

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17y ago

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