Particle model of matter Flashcards
Who made the plum pudding model?
J.J Thompson
Where does the word “atom” come from?
The word atomos meaning uncuttable
what is the plum pudding?
an atom which has a ball of positive charge with negative electrons embedded in it.
who did an experiment to test the plum pudding model?
Earnest Rutherford
in the experiment, what was fired at thin gold foil?
positively charged alpha particles
what are alpha particles?
helium nucleuses
what is the nuclear model?
scientific ideas that atoms have electrons surrounding a nucleus that contain protons and neutrons
where is the mass of the atom concentrated at?
the centre, its nucleus
what happened that surprised the scientists?
most alpha particles did not pass straight through the foil
what is evidence for the atom being mostly empty space?
the fact that most alpha particles went straight through the foil
a small number of alpha particles being deflected at large angles suggested that
There is a concentration of positive charge in the atom
