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Thomson
suggested atoms were spheres of positive charge with tiny negative electrons stuck in them like fruit in a plum pudding- the plum pudding model.
Niels Bohr
said that electrons orbiting the nucleus do so at certain distances called energy levels.
Rutherford
replaced the plum pudding model with the nuclear model.
1804
In , John Dalton agreed with Democritus that matter was made up of tiny spheres that couldnt be broken up, but he reckoned that each element was made up of a different type of atom.
nuclear model
The that resulted from the alpha particle scattering experiment was a positively charged nucleus surrounded by a cloud of negative electrons.
overall positive charge
It has an
protons and neutrons
The nucleus contains_
empty space
The rest of the atom is
negative electrons
move around the outside
number of neutrons
Number of protons=_