When Did John Dalton Discover the Atomic Theory?

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John Dalton was an English physicist and chemist most renowned for his work in the development of the atomic theory and colour blindness. He coined the atomic theory in the early 19th Century when he was secretary of the Manchester Literary and Philosophical Society.
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1808.
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John Dalton was the originator of atomic theory, which theory provided
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" In 1803 John Dalton Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. Source(s) http://atomictimeline.net/index.php.
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John Dalton was an early English chemist who first developed an atomic theory. He postulated that elements were composed of units called atoms. He thought that atoms could not be
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What John Dalton discovered is that, elements were made of the smallest particles called atoms. He also found out that all atoms for a particular element were ...
Daltons Billard ball model states atoms of the same elements have the same masses and they also combine to form a compound. Dalton's theory was founded in 1802. ...
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