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A molecule is a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance. The division of a sample of a substance into progressively smaller parts produces no change in either its composition or its chemical properties until parts consisting of single molecules are reached. Further subdivision of the substance leads to still smaller parts that usually differ from the original substance in composition and always differ from it in chemical properties. In this latter stage of fragmentation the chemical bonds that hold the atoms together in the molecule are broken.
added by Anonymous 86 days ago 0    0

what is molecule.
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Smallest particle of a substance elements or compound which can exist freely in nature and shows all properties of a substance is called molecule. molecule is a neutral particle it is so small that it can not be sen .

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