atomic structure history

Question 1

Which Greek philosopher suggested that all matter is made of tiny, undividable particles?

Answer 1

Democritus

Question 2

Which Scientist agreed with the theory of tiny, undividable particles in 1803?

Answer 2

John Dalton

Question 3

What sub-atomic particle did JJ Tomson discover?

Answer 3

Electron

Question 4

Describe the plum pudding model.

Answer 4

A sphere of positive charge with negative electrons embedded in it

Question 5

What experiment did Ernest Rutherford conduct in 1909?

Answer 5

Gold foil experiment

Question 6

Did the results of Rutherford’s experiment confirm or disprove the plum pudding model?

Answer 6

Disprove

Question 7

In Rutherford’s experiment the majority of alpha particles passed through the gold foil, what does this mean for the model of the atom?

Answer 7

The majority of the atom is empty space

Question 8

In Rutherford’s experiment some alpha particles were deflected at a small angle, what does this mean for the model of the atom?

Answer 8

There are very small electrons in the atom

Question 9

In Rutherford’s experiment a very small number of alpha particles were deflected at a large angle what does this mean for the model of the atom?

Answer 9

There is a concentrated, positive mass at the centre of the atom