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Atomic Theory

Scientist Facts

QuestionAnswer
440 B.C. Democritus
Atoms are uncuttable Democritus
"Atomos" meaning indivisible Democritus
1803 Dalton
Atoms of different elements are different Dalton
Conducted experiment combining elements; elements combine in proportions Dalton
All substances are made of atoms Dalton
Atoms of the same element are exactly alike Dalton
1897 Thomson
Small, negatively charged particles inside the atom Thomson
Cathode Ray Tube Experiment Thomson
Plum Pudding Model Thomson
1911 Rutherford
Small, dense positively charged nucleus Rutherford
Most of an atom's mass is in the nucleus Rutherford
Atoms contain mostly empty space Rutherford
Electrons travel around nucleus like planets Rutherford
Gold Foil Experiment Rutherford
1913 Bohr
Electrons jump between levels from path to path Bohr
Electrons travel in definite paths Bohr
Electron paths are called levels Bohr
Twentieth century Heisenberg and Schrodinger
Electrons are found in electron clouds not paths Heisenberg and Schrodinger
Electron paths cannot be predicted Heisenberg and Schrodinger
Atoms cannot be created, divided, or destroyed Dalton
Levels are certain distances from the nucleus Bohr
No paths are located between levels Bohr
Inside the nucleus is the protons Heisenberg and Schrodinger
Created by: madison.heaton