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a polymer used in manufacture of synthetic resins, fibres and plastics.
the electrons in the outermost occupied shell of an atom.
a group of very reactive chemical elements that readily lose their one valence electron to form...
a white crystalline organic compound used as a fertilizer, in medicine and in resins.
a number that indicates how the atom will react during the formation of chemical bonds.
the distance between the centres (nuclei) of atoms joined in a bond.