Francium is a chemical element that has the symbol Fr and atomic number 87. Soviet chemist D.K. Dobroserdov was the first scientist to claim to have found eka-caesium. Perey's francium analysis. Synthesising francium processing in nuclear reaction.
13.11.2009 |
Chemistry |
Иностранные языки и языкознание |
Язык: английский |
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