1.2.1 Atomic model

Question 1

Tell me about Dalton’s model.

Answer 1

In 1803, he suggested that everything was made of atoms and that atoms cannot be split.
Scientist improved this with the discovery of sub-atomic particles..

Question 2

Tell me about Thompson’s Plum pudding model.

Answer 2

In 1897, J. J. Thompson discovered electrons. Described as a positive charged sphere with electons embedded.

Question 3

Tell me about Rutherford’s nuclear model.

Answer 3

1909, Rutherford discovered alpha particles could bounce off atoms.
He concluded that most of atoms mass was in the nucleus containing positively charged particles called protons.

Question 4

Tell me about the modern atomic model

Answer 4

Niels Bohr discovered that electrons orbit the nucleus at fixed distances.
In 1932, James Chadwick discovered that some particles in the nucleus have no charge - neutrons

Question 5

Tell me about protons.

Answer 5

Charge: +1
Mass: +1
Often reffered to as atomic number.

Question 6

Tell me about electrons.

Answer 6

Charge: -1
Mass: 0.0005
Often equal to the number of protons

Question 7

Tell me about neutrons.

Answer 7

Charge: 0
Mass: 1