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METAMERISM, a technical term used in natural science. In chemistry it denotes the existence of different substances containing the same elements in the same proportions and having the same molecular weight; it is a form of isomerism.

In position isomerism, the basic carbon skeleton remains unchanged, but important groups are moved around on that skeleton.

For example, there are two structural isomers with the molecular formula C₃H₇Br. In one of them the bromine atom is on the end of the chain, whereas in the other it's attached in the middle.

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