Believed that atoms are small, hard particles that were "indivisible"

• Democritus
• Aristotle
• Schrodinger
• Greek Philosophers

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

• John Dalton
• JJ Thomson
• Earnest Rutherford
• Erwin Schrodinger

Tags

NGSS.MS-PS1-1

Which of the following are parts of Dalton's theory?

• 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

Who was the first person to describe matter as "atoms"?

• Democritus
• Dalton
• Thomson
• Rutherford

Which of the following scientists added negatively-charged particles to the model of the atom?

• Niels Bohr
• John Dalton
• Ernest Rutherford
• J. J. Thomson

What were J. J. Thomson's three contributions to the atomic theory?

• Discovered the electron

• Discovered the nucleus -did the gold foil experiment

• Used the cathode ray tube in his discovery

• Created a model of the atom with electrons moving around the nucleus in fixed orbits

• Created the "plum pudding" model of the atom

This is a model of what was thought be an atom after what experiment?

• Cathode Ray Tube Experiment
• Gold Foil Experiment
• Plum Pudding Model
• Planetary Model

This is a model of what was thought be an atom after what experiment?

• Cathode Ray Tube Experiment
• Gold Foil Experiment
• Plum Pudding Model
• Planetary Model

The drawing above is Thomson’s ________.

• cathode ray tube experiment
• oil drop experiment
• gold foil experiment

Tags

NGSS.HS-PS1-8

Who believed the atom was a solid sphere?

• JJ Thompson
• Rutherford and Dalton
• Rutherford
• Democritus and Dalton