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came up w/ the concept of the atom

Did Aristotle agree with Democritus' concept?

No, he believed in the elements fire, water, earth, and air.


found out that the total mass of reactants was = to the total mass of products; Law of Conservation

Law of Conservation

mass is neither created nor destroyed during ordinary chemical reactions or physical changes


law of definate porportion (proust's law)

Law of Definate Porportion

regardless of the size of the sample, a chemical compound will always contain the same elements of the same porportions


proposed the 1st atomic theory; law of multiple porportions

5 postulates

1.) all matter is composed of atoms
2.) atoms of the same element are identicle
3.)atoms can't be subdivided, created, nor destroyed
4.) atoms of different elements combine to form compounds
5.) during chemical reactions, atoms are combined, separated,or rearranged

Law of Multiple Porportions

In a compound of 2 of the same element, the mass of the second element combines with that of the 1st element, and it's ration consists of small whole numbers


designed the plumb pudding model which explained the distribution of electrons


used an oil drop experiment that suspended electrons long enough for him to measure mass


found out that energy was connected to frequency based on the # planck's constant. Studied color lines


came up w/ bohr model; an electron heated at ground state jumps to excited state and releases a photon color


electrons moved in a wave function

Schrodinger (aka math guy)

created data that better explains where electrons are located in the atom

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