People Flashcards
1
Q
450 B.C.
Was the first to theorize atoms existence
A
Democritus
2
Q
1803 AD
Started modern day studies of atoms
“Atoms can not be created nor destroyed”
A
Dalton
3
Q
1897
Came up with “plum pudding” theory
Found out electrons exist
A
Thomson
4
Q
1909
Discovered how to find the charge of an electron
“oil drop experiment”
(1.6 X 10 -19 coulombs or -1)
A
Millikan
5
Q
1913
Describing orbit levels of an electron through energy levels
A
Bohr
6
Q
1910 1919
Discovered Nucleus
Found protons exist in the nucleus
(and that they exist in general)
A
Rutherford
7
Q
1932
Discovered neutrons existence
A
Chadwick
