Chapter 7: Understanding Atoms

What is the basic building block for all matter in the universe?

• cell

• electron

• nucleus

• atom

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What is a substance called that consists of a single type of atom?

• element

• quark

• proton

• molecule

Around how long do atoms last?

• only a few seconds

• 4 to 5 days

• 10,000 years

• nearly forever

What two basic particles make up the nucleus of an atom?

• proton and electron

• neutron and proton

• quark and electron

• quark and electron cloud

What positively charged particle is located at the center of the atom in the nucleus?

• electron

• proton

• neutron

• quark

A particle with one negative charge is a (n)

• atom

• proton

• neutron

• electron

A particle with a positive charge is a (n)

• atom

• proton

• neutron

• electron

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Who discovered electrons?

• Dalton

• Aristotle

• Democritus

• Thomson

Rutherford and his students did experiments that showed the existence of the

• quark.

• nucleus.

• electron.

• proton.

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Bohr proposed that electrons are located in the

• nucleus

• electron cloud

• circular orbits around the nucleus

• quark