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paperback. Zustand: New. Paperback. Pub Date :2014-01-01 Pages: 258 Language: Chinese Publisher: People's Education Press in certain compounds. the atoms of different elements often have two or more closely together to form a group of atoms. Such radicals. in many chemical reactions. as a whole participate in the reaction. as if one atom. and also with a charge. Such radicals also called root. a root with valency. generally referred to at the root. Contents: The first part of the basic concepts and theories of a comp.