1.1 The Changing Atom

Question 0

Early 1800’s

Answer 0

John Dalton. 
Tiny particles that make up elements. 
Can't be divided.
All atoms of a given element are the same. 
Developed first table of atomic masses.

Question 1

Fifth century

Answer 1

Greek philosopher, Demicritus, thought matter was made of indivisible particles.

Question 2

Joseph John Thomson.

Answer 2

Experiments using cathode rays.
Discovered electron.
Negative charge.
Very, very small particles.

Question 3

Who?

Answer 3

Democritus.
John Dalton. 
Joseph John Thomson.
Ernest Rutherford.
Neil's Bohr.