mendeleev table period
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mendeleev table period |
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| navigate by keyword : atom atomic background beaker blocks chart chemical chemistry class color compare configuration different education electronegative electrons element frame full gas graphic groups helium hydrogen illustration isolated lab lavoisier mass mendeleev molecule nature nuclear number order periodic periods physics research row school science scientific script shot signs symbols systematize table teach technique technology text typescript valence vector weight |
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| Period 1 from the periodic system of chemical elements |
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