Atomic Theory

Front

Who believed that atoms are small, hard particles that were "indivisible"?

Back

Democritus

Front

Who was the first person to publish a theory about the existence of atoms?

Back

John Dalton

Front

Which of the following are parts of Dalton's theory? Options: All substances are made of atoms., Atoms Join with other atoms to make new substances., Atoms of different elements are different, All of these are part of his theory

Back

All of these are part of his theory

Front

Who was the first person to describe matter as "atoms"? Options: Democritus, Dalton, Thomson, Rutherford

Back

Democritus

Front

Which scientist added negatively-charged particles to the model of the atom? Options: Niels Bohr, John Dalton, Ernest Rutherford, J. J. Thomson

Back

J. J. Thomson

Front

This is a model of what was thought to be an atom after what experiment? Options: Cathode Ray Tube Experiment, Gold Foil Experiment, Plum Pudding Model, Planetary Model

Back

Gold Foil Experiment

Front

This is a model of what was thought to be an atom after what experiment? Options: Cathode Ray Tube Experiment, Gold Foil Experiment, Plum Pudding Model, Planetary Model

Back

Cathode Ray Tube Experiment

Front

The drawing above is Thomson’s ________. Options: cathode ray tube experiment, oil drop experiment, gold foil experiment

Back

cathode ray tube experiment

Front

Who believed the atom was a solid sphere?

Back

Democritus and Dalton

Front

What explains the path of the cathode ray in the image above?

Back

The particles are deflected away from the negative electrode and attracted to the positive electrode.