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The empirical formula of an ionic compound or a covalent network (macro-molecule) structure. To be used as an independent entity for stoichiometric equations.
a vertical column of elements in the periodic table which have similar properties.
a group of organic compounds where an oxygen atom has replaced two hydrogen atoms on an end...
a polymer used in manufacture of synthetic resins, fibres and plastics.
the substance that undergoes reduction and causes the other substance to undergo oxidation.