Robert Millikan

Joseph Proust

Ernest Rutherford

J. J. Thomson

John Dalton

Joseph Proust

Ernest Rutherford

J. J. Thomson

It was based on sound evidence.

There were explanations for the idea.

It was based on the thoughts of an early philosopher.

There were experiments conducted to support the idea.

cathode ray particles can move at very fast speeds.

cathode ray particles can be moved by electric current.

atoms contain small positively charged particles that are called protons.

atoms contain small negatively charged particles that are called electrons.

The accepted model of the atom was changed.

The accepted model of the atom was supported.

Cathode ray tubes were no longer used in experiments due to poor results.

Cathode ray tubes became the only instrument of use in the study of atoms.

the plum pudding model

the indivisible atom model

an atom that had a lot of empty space

an atom that had a concentrated nucleus

electron

neutron

proton

photon

Ernest Rutherford’s experiment led to the nuclear model of the atom.

Ernest Rutherford’s experiment established the plum pudding model of the atom.

Robert Millikan’s postulates form the most accepted theory for the atomic structure.

Robert Millikan’s results had little impact on determining of the charge of an electron.

Atoms are made up of mostly empty space.

Atoms are mainly solid and block alpha particles.

The volume of the nucleus is large compared to the rest of the atom.

The mass of the nucleus is small compared to the rest of the atom.

Their positive charge is located in a small region that is called the nucleus.

Their negative charge is located in small particles that are called electrons.

Their nucleus makes up the majority of the volume of the atom.

Their electrons are floating in a sea of positive charges.