feb 13, 1803 - John Dalton's Contribution to the atomic theory
Description:
He believed that matter is made up of individual atoms (which he was wrong because atoms can be divided), all atoms of a particular elements are identicle (which he was wrong because it doesnt account for isotopes), different elements are composed of different kind of atoms, compounds are composed of atoms in specific ratios and atoms are not created or destroyed in a reaction.Added to timeline:
Date:
feb 13, 1803
Now
~ 222 years ago