C1.2.3 - Developing the atomic model Flashcards
In 1803, what did John Dalton suggest about matter?
That all matter is made from atoms
In 1897 what subatomic particle did Joseph John Thomson discover?
The electron
What did the plum pudding model suggest?
It suggested that atoms are spheres of positive charge with electrons dotted around inside
What did Rutherford do?
He did an experiment with others where he pointed beams of alpha particles at thin gold foil
What were the results of the Rutherford experiment?
Most of the alpha particles went straight through, many of them changed direction slightly and some even came back
What was the conclusion from the Rutherford experiment?
He suggested that outside the nucleus, electrons orbit like plants in a solar system
Which did Bohr do?
He realised that orbiting electrons would be attracted to the oppositely charged nucleus and would spiral inwards some he improved Rutherford’s model which is the model we use now
