History of the Atom

Question 1

Democritus

Answer 1

Atoms (atomos- indivisible); the void = empty space

Question 2

Gassendi

Answer 2

brought back the idea of atoms after Aristotle turned it down

Question 3

John Dalton

Answer 3

Atomic Theory:

1. All matter is composed of atoms
2. Atoms cannot be created or destroyed
3. All atoms of same element are identical; all atoms of different elements are different
4. Chemical reactions occur when atoms are rearranged
5. Compounds are formed by different types of atoms

Question 4

JJ Thompson

Answer 4

Plum pudding model

Cathode Ray Tube- electrons

Question 5

Robert Millikan

Answer 5

Oil drop- charge of electrons

Question 6

Rutherford

Answer 6

Gold Foil Experiment
nucleus and protons
violet death

Question 7

Chadwick

Answer 7

discovered neutrons

Question 8

Bohr

Answer 8

no violet death

electron levels

Question 9

Bohr’s electon levels

Answer 9

1 - 2 
2 - 8 
3 - 18
4 - 32 
5 - 50