The Atom Flashcards
1
Q
Greeks
A
First said matter was made of small divisible particles
2
Q
William Crookes
A
-passed electric current through a vacume
3
Q
Cathode Rays
A
-streams of negatively charged particles called electrons
4
Q
JJ Thomson
A
-discovered the electron
-cathode rays were attracted to the positively charged plate
-they must be negativey charged particles
5
Q
Robert Milikan
A
-oil drop experiment
-particles were negatively charged, they were suspended (didn’t obey gravity)
- calculated mass of e-
6
Q
Dalton /Dalton’s Model
A
-all matter is made from atoms
-atoms are indivisible
-atoms cannot be created or destroyed
7
Q
Thomson’s Plum Pudding Model
A
sphere of positive charge with e- embedded at random
8
Q
A
