Defining the Atom

What is an atom made of?

• A nucleus containing protons and neutrons; electrons move around the nucleus.

• Only protons and electrons.

• A nucleus containing only electrons.

• Neutrons and electrons only.

Where are electrons located in an atom?

• Inside the nucleus.

• Moving around the nucleus.

• Attached to protons.

• Inside neutrons.

What is the smallest unit of an element that retains the properties of that element?

• Molecule

• Atom

• Compound

• Mixture

Which subatomic particle has a negative charge?

• Proton

• Neutron

• Electron

• Nucleus

What is the central part of an atom called?

• Electron cloud

• Proton

• Nucleus

• Neutron

Which subatomic particle is found in the nucleus and has no charge?

• Proton

• Electron

• Neutron

• Cathode ray

What is a stream of electrons observed in vacuum tubes?

• Proton beam

• Cathode ray

• Neutron stream

• Atomic ray

What is the smallest particle of an element that retains the properties of the element?

• Molecule

• Atom

• Electron

• Proton

If you scale up the size of an atom to the size of an orange, how large would the orange be if scaled up using the same factor?

• As large as a basketball

• As large as a car

• As large as the earth

• As large as a house

What is the name of the ray of radiation that travels from the cathode to the anode when an electric charge is applied?

• Anode ray

• Cathode ray

• Gamma ray

• X-ray