Early Models Flashcards
0
Q
What did Dalton do?
A
He showed in the early 1800’s that matter was made of atoms using uniform spheres.
1
Q
What did Aristotle first propose?
A
He proposed all matter is uniform.
2
Q
What did JJ Thompson do?
A
He found that atoms have charge.
3
Q
What did Rutherford do?
A
In 1911 he dismisses the spherical model used previously and developed the idea of a central positive nucleus.
4
Q
What did Niels Bohr do?
A
He concluded in 1913 that that the nucleus of the atom contains protons and neutrons and that electrons travel in fixed orbits around the nucleus- the planetary atomic model
5
Q
What was the cloud model?
A
By 1926 the planetary model was dismissed and the cloud model was dismissed
