Dalton

Dalton thought atoms were like smooth round spheres that couldn't be broken down into pieces. This was due to the results of experiments that he did.

Through experiments Dalton discovered that: Compounds are formed from elements in specific whole number ratios indicating the elements were made of tiny little pieces. For example two H atoms for every one O atom in water. Atoms are rearranged in whole number ratios in chemical reactions. Atoms couldn't be broken down, made or changed using chemistry. Different kinds of atoms have different weights.

Dalton share his results in 1803.

http://www.brooklyn.cuny.edu/bc/ahp/FonF/Dalton.html

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