11CHE

Question 1

What did Democritus propose?

Answer 1

Atomic Theory: All matter is made of indestructible particles he called atom.

Question 2

How did John Dalton develop the idea of the Atom?

Answer 2

Suggested atoms are small, unbreakable and make up elements. Different elements make up compounds.

Question 3

What was JJ Thompson concept of the atom?

Answer 3

Discovered the electron, and developed the Plum Pudding model. (Basically a positively charged sphere (pudding) that contained electrons (plum)).

Question 4

How did Ernst Rutherford help Develop the atom?

Answer 4

Demonstrated the existence of the atomic nucleus. (+ with electrons orbiting it)

Question 5

How did Niels Bohr propose?

Answer 5

He proposed that there were more electrons on the outer shells then in the inner shells and that they didn’t randomly move.

Question 6

What was James Chadwick proposal that solidified our knowledge on atoms?

Answer 6

He discovered the neutron, explaining how different atoms of the same elements have different weights.