People

Question 1

John Dalton

Answer 1

First to prove that matter was up of atoms. Said chemical reactions were just rearrangements of these atoms.

Question 2

J.J. Thompson

Answer 2

Proposed that atoms were made of positive and negative charges. Accepted atoms. Developed the “cookie” model

Question 3

Sir Ernest Rutherfordford

Answer 3

Discovered the nucleus. Gold foil experiment. Realized that the nucleus was very small.

Question 4

Niels Bohr

Answer 4

Said electrons would have to occupy specific orbitals around the nucleus and wouldn’t exist as a cloud. Each electron would have a specific energy and could only a sob or emit energy from one orbital to another

Question 5

Dimitri Mendeleev

Answer 5

Created the periodic table