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who was the scientist who pioneered on counting of the number of atoms and molecules of substances?

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Answer:

Amedeo Avogadro

Italian scientist Amedeo Avogadro, whose work led to the concept of the mole as a counting unit in chemistry. The number 6.02 × 1023 is called Avogadro's number, the number of representative particles in a mole.12 Mar 2013