compounds with oxygen—six that are stable in air and others that are not. The mass of manganese per gram of oxygen in three of those compounds is given in the table below. Show that these masses are consistent with the law of multiple proportions. Compound Grams Mn per Gram O a 2.2892 2 2.5753 iii 0.98107

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.