Understanding Atoms and Matter

What are the two essential characteristics that define matter?

• It must be visible and tangible.

• It must be solid and liquid.

• It must have color and texture.

• It must have mass and occupy space.

Which of the following particles is found in the nucleus of an atom and has no electrical charge?

• Neutron

• Photon

• Proton

• Electron

What charge does a proton carry?

• Negative

• Positive

• Neutral

• Variable

How do particles with opposite charges interact with each other?

• They attract each other.

• They combine to form a new particle.

• They repel each other.

• They remain neutral.

What is another term for the pathways that electrons follow around the nucleus?

• Photon track

• Neutron orbit

• Proton path

• Electron shell