SCIENTIST METHOD CONTRIBUTION
and the Questioning, Hypothesized concept of
Greeks 2000 observing, inferring atom…ATOMOS = “indivisible”
Came up w/ ATOMIC THEORY:
1) All elements are made of atoms.
2) Atoms of same element are exactly
John Dalton alike.
Found that gases
1803 3) Atoms of different elements are
were made of
4) Molecules are the result of the
chemical combo of atoms.
Discovered atom was divisible
Contains the ELECTRON
through an uncharged
gas… Plum Pudding model
1897 + - +
– particles came - + -
out! + - +
“Shot” + particles
Ernest through a piece of Discovered center of atom = nucleus
Rutherford gold foil…some Nucleus has + charge
1908 passed through… e- are floating in mostly empty space
some bounced back
Hypothesized and Created the Bohr Model
built upon work of Electrons “orbit” nucleus in definite
Rutherford circles called energy levels.
Impossible to determine the exact
Worked with location of an electron
MATHEMATICAL Energy of electron at a given time
equations determines its location
Opposite of Bohr Model