jan 1, 1804 - John Dalton's Atomic Theory
Description:
John Dalton's atomic theory had the following ideas:1. All matter is composed of extremely small particles called atoms.
2. Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties.
3. Atoms cannot be subdivided, created, or destroyed.
4. Atoms of different elements can combine in simple whole number ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged.
Added to timeline:
Date:
jan 1, 1804
Now
~ 221 years ago