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Introduction to Atomic Models - Answers
Electron Cloud Model
A:
Nucleus
B:
Electron cloud
C:
Neutron
D:
Proton
E:
Electron
Name of model:
Billiard Ball model
Used to explain:
Everything is made of atoms
Developed by:
Name of model:
Experiment:
Developed by:
Name of model:
Experiment:
Developed by:
John Dalton, 1808
Plum Pudding model 1897
Cathode Ray tube
J. J. Thomson
Nuclear model
Gold Foil experiment
Ernest Rutherford 1911
Name of model:
Bohr model (Planetary) 1913
Used to explain:
Energy levels of electrons
Developed by:
Niels Bohr
Why do we have different models to describe the atom?
Over time, as our understanding of the atom has improved, the model of the atom has been refined to
better illustrate our new understanding. For example, When J.J. Thomson discovered that the atom
contained a negative charge; the Billiard ball model was not accurate anymore, and we had to have a
new model: the Plum pudding model, which shows the separate positive and negative charges.