Atomic theory

What did John Dalton propose about compounds?

• They consist of different types of atoms in whole number ratios

• They are indivisible particles

• They have no specific structure

• They are made up of electrons only

What was Ernest Rutherford's gold foil experiment about?

• Discovering the nucleus

• Discovering neutrons

• Discovering electrons

• Discovering protons

What did Ernest Rutherford's experiment suggest about the atom's structure?

• Atoms have a negative charge

• Atoms have no charge

• Atoms are mostly empty space

• Atoms are solid and dense

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CCSS.RI.11-12.5

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CCSS.RI.9-10.5

Which scientist provided the first empirical evidence that atoms exist?

• JJ Thomson

• Democritus

• Ernest Rutherford

• John Dalton

What did JJ Thomson propose about the distribution of charges in an atom?

• They are evenly distributed

• They are all positive

• They are all negative

• They are positive and negative

What did Ernest Rutherford's experiment with alpha particles suggest about the atom's nucleus?

• It is neutral

• It is positively charged

• It is negatively charged

• It is made up of electrons only

What did JJ Thomson discover in his cathode ray experiment?

• Protons

• Neutrons

• Electrons

• Nucleus

Who was the first to propose that matter is comprised of fundamental indivisible particles?

• John Dalton

• Ernest Rutherford

• Democritus

• JJ Thomson

What is the significance of the atomic theory in chemistry?

• It explains why elements have specific atomic numbers by mass

• It provides the basis for understanding chemical reactions.

• It disproves the existence of atoms.

• It describes only the physical properties of elements.

What did John Dalton's atomic theory explain about the mass ratio of hydrogen and oxygen in water?

• 1/3 hydrogen and 2/3 oxygen by mass

• 1/9 hydrogen and 8/9 oxygen by mass

• 1/4 hydrogen and 3/4 oxygen by mass

• 1/2 hydrogen and 1/2 oxygen by mass