history of the atom

Question 1

who discovered the plum pudding model? (J.J _ _ __ _ _ _)

Answer 1

J.J Thompson

Question 2

what did J.J think the atom looked like?

Answer 2

he thought it was a big mass of negative charged atoms with positive charged atoms randomly spread around

Question 3

who came to finish J.J’s work? (R and M)

Answer 3

Rutherford and Marsden

Question 4

what did Rutherford and Marsden launch at a thin piece of gold?

Answer 4

alpha particles.

Question 5

what happened to:
- 99%
-0.9%
-0.1%
of the alpha particles?

Answer 5

99% went straight undisturbed

0. 9% where altered a little bit by the negative particles
1. 1% are reflected by the positive particles when the hit the nucleus straight on

Question 6

what did Niels Bohr say about the atom after rutherford and marsdens discovery (galaxy)

Answer 6

he suggested that the electrons are orbiting the nucleus which contains positive and negative charges