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Centries ago , a Greek philosopher , Democritus belived , that all matter was composed of extremely small particles to which he give the name Atomos meaning not to divide. During the early nineteeth centry an English scientist John Dalton , did some carefull experiment. His results convinced that atoms were not all alike .They differ in size , mass , and chemical behaviour , for example oxygen atoms are bigger and greater than hydrogen atoms.

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Q: Who was the first scientist to discover atoms?
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