Atom History

First, fold your paper in half like this. Not this.

Do not write these numbers on your flaps! You need five “flaps.” 1 To cut “flaps,” cut only the top half of the folded paper. 2 3 4 Do not write these numbers on your flaps! 5

Quantum Mechanical Model Solid Sphere Model Plum Pudding Model Nuclear Model Planetary Model Quantum Mechanical Model

1 Dalton 2 3 4 5

smallest unit of matter 1 2 smallest unit of matter no protons, neutrons, or electrons present 3 4 5

cathode ray tube experiment 1 Thomson 2 cathode ray tube experiment 3 4 5 7

electrons embedded in positively charged matter 1 2 electrons embedded in positively charged matter 3 4 5 8

1 2 Rutherford 3 gold foil experiment 4 5 9

small positively charged nucleus electrons fixed outside nucleus 1 2 3 small positively charged nucleus electrons fixed outside nucleus remainder of atom is empty space 4 5 10

1 2 Bohr 3 4 5 11

small positively charged nucleus 1 2 small positively charged nucleus negative electrons move in fixed orbits outside nucleus 3 4 5 12

1 2 Heisenberg Schrödinger deBroglie 3 4 5 13

small positively charged nucleus 1 2 3 small positively charged nucleus electrons localized to orbitals 4 5 14