Developing the Model of the Atom

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=_