Atomic History

Question 1

Democritus

Answer 1

Main idea- Matter cannot be infinitely broken down
Important concepts- No evidence
Picture: Just a circle

Question 2

Dalton

Answer 2

Main Idea- Materials combine in specific ratios of different types of atoms
Important concepts: First proof of atoms
Picture: A larger circle with two smaller circles (mickey mouse ears)

Question 3

Thomson

Answer 3

Main Idea- Atoms are made of tiny charges attached to a uniform positive charge
Important concepts: Electrons
Picture: A circle with a plus with four electrons inside (plum pudding)

Question 4

Rutherford

Answer 4

Main Idea- Atoms are mostly empty space with a heavy, central nucleus containing positive charge
Important concepts- Nucleus
Picture- A circle with a smaller circle inside that has a plus and outside the larger circle there is a electron

Question 5

Bohr

Answer 5

Main Idea- Atoms consists of a central positive nucleus surrounded by electrons which occupy specific levels
Important concepts- Orbits
Picture- A larger circle with another circle inside with a smaller circle inside and inside that smaller circle there is a plus sign and outside the 1st and second circle there is an electron

Question 6

Millikan

Answer 6

Determined the charge of an election using the oil drop experiment

Question 7

Heisenberg

Answer 7

Dev the uncertainty principle, you can’t perfectly know an electron’s location and postion)

Question 8

Schrodinger

Answer 8

Showed that electrons behaved like waves, created Quantum Mechanics

Question 9

Chadwick

Answer 9

Discovered neutrons and developed understanding of nuclear reactions