History of Atoms Flashcards
1
Q
What is the mass of a proton?
A
1.67 x 10^(-27) kg
2
Q
What is the mass of neutron?
A
1.67 x 10^(-27) kg
3
Q
What is the mass of an electron?
A
9.11 x 10^(-31) kg
4
Q
Who first put forth the idea of atoms?
A
Democritus
5
Q
Who came up with the 1st serious theories about atomic structure?
A
Dalton
6
Q
Who theorized the law of constant proportions and the law of multiple proportions?
A
Dalton
7
Q
Who discovered electrons and how?
A
JJ Thomson
Using a cathode ray tube.
8
Q
Who discovered the charge of electrons?
A
Millikan
9
Q
Which two scientists discovered the mass of an electron together?
A
JJ Thomson and Millikan
10
Q
Who discovered the nucleus and how?
A
Rutherford
Shot alpha particles through a thin gold foil and found that subatomic particles scattered
11
Q
Who discovered the neutron and nuclear force?
A
Chadwick
