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molecule where the ratio of atoms is 1 : 6 , e.g. SF6
a measure of the number of bonds formed by an atom of a given element.
molecule which generally contains carbon atoms. There are some exceptions including CO2 , HÂ...
a very reactive atom or group of atoms with an unpaired valence electron.
a solution containing much acid dissolved in little water.
chemical calculations that involve amounts of different chemicals.