8 IS 3.1

According to modern terms, what is an atom?

• The largest part of an element

• The smallest particle that still can be considered an element

• A visible piece of matter

• A large molecule

What did Dalton think atoms were like?

• Soft, flexible balls

• Smooth, hard balls

• Large, visible pieces

• Liquid drops

What did J.J. Thomson discover about atoms in 1897?

• Atoms are indivisible.

• Atoms contain negatively charged particles called electrons.

• Atoms are made of protons only.

• Atoms have no charge.

What was the main finding of Rutherford's Gold Foil Experiment?

• All particles passed through the foil without deflection.

• Most particles passed through, but some were deflected at large angles.

• No particles passed through the foil.

• All particles were deflected back.

What did Rutherford conclude about the structure of the atom?

• Atoms are solid throughout.

• Atoms are mostly empty space with a positive charge at the center.

• Atoms have no empty space.

• Atoms are negatively charged throughout.

What did the deflection of particles in Rutherford's experiment indicate?

• Atoms are solid.

• Atoms have a dense center.

• Atoms are hollow.

• Atoms are liquid.

What did Rutherford infer about the atom's positive charge?

• It is spread throughout the atom.

• It is located in the electrons.

• It is packed within a small region in the center.

• It is located in the outer shell.

In what year did Bohr revise the atomic model?

• 1905

• 1913

• 1920

• 1935

Which model suggested that electrons orbit the nucleus like planets?

• Dalton's Model

• Thomson's Model

• Bohr's Model

• Cloud Model

What surrounds the nucleus in the modern model of the atom?

• Protons

• Neutrons

• Cloud of electrons

• Photons