Quiz on Atomic Theory

Who introduced the concept of the atom around 450 B.C.?

• Aristotle

• John Dalton

• Democritus

• Isaac Newton

What term did Democritus use to describe the smallest pieces of matter?

• Molecules

• Atomos

• Elements

• Particles

According to Dalton's atomic theory, what are all substances made of?

• Molecules

• Elements

• Atoms

• Compounds

Which of the following is NOT a part of Dalton's atomic theory?

• Atoms can be divided into smaller particles.

• All atoms of the same element are alike and have the same mass.

• Atoms join together to form compounds.

• Atoms cannot be created or destroyed.

Which part of Dalton's theory is no longer accepted today?

• Atoms are the smallest particles.

• Atoms join together to form compounds.

• All atoms of the same element are alike.

• Atoms cannot be created or destroyed.

What was the major advance in the history of the atom discovered in 1897?

• Protons

• Neutrons

• Electrons

• Quarks

What did Thomson use in his experiments to discover electrons?

• A magnet

• A vacuum tube

• A laser

• A microscope

What did Thomson's experiments show about the charge of the particles?

• The charge is positive.

• The charge is neutral.

• The charge is negative.

• The charge is variable.

What did Thomson observe about the positive and negative plates in his experiment?

• They repel each other.

• They attract each other.

• They cause the electric current to bend toward the positive plate.

• They cause the electric current to bend toward the negative plate.

What was the surprising result of Rutherford's gold foil experiment?

• All alpha particles passed straight through the foil.

• All alpha particles were deflected.

• A few alpha particles bounced back from the foil.

• No alpha particles passed through the foil.