History Of The Atom

Question 1

What idea did Democritus come up with?

Answer 1

That all matter is made up of unbreakable particles called atoms

Question 2

What did Aristotle do?

Answer 2

First to say everything is made out of four elements – earth, water, air and fire

Question 3

What did John Dalton do?

Answer 3

Made a model based on experiment called billiard ball theory

Question 4

What did John Dalton start?

Answer 4

1. All matter is made up of atoms
2. Atoms are solid spheres
3. Atoms are in divisible/unbreakable
4. Atoms of different elements have different masses
5. Atoms can combine to form compounds

Question 5

What did JJ Thompson do?

Answer 5

First to aknowledge that atoms have negatively charged electrons (e-)

*Plum pudding model

Question 6

What did Ernest Rutherford do?

Answer 6

Discovered how empty the space is in all atoms and the centre [the nucleus] is positive

• Gold foil experiment

Question 7

What did Niels Bohr figure out?

Answer 7

Electrons orbit the nucleus in energy shells

Question 8

What did Chadwick figure out?

Answer 8

Existence of neutrons in the nucleus