What are atoms often referred to as?

• Molecules

• Chemical compounds

• Building blocks of matter

• Elements

What is the central part of an atom called?

• Electron

• Proton

• Nucleus

• Neutron

Which particles are found in the nucleus of an atom?

• Electrons and protons

• Protons and neutrons

• Neutrons and electrons

• Only protons

What charge does a proton have?

• Negative

• Positive

• Neutral

• No charge

Why don't electrons fly away from the atom?

• They are held by gravity

• They are attracted to protons

• They are attracted to neutrons

• They are too heavy

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What unit is used to measure the mass of protons and neutrons?

• Kilograms

• Milligrams

• Atomic Mass Unit (AMU)

• Grams

How much does an electron weigh compared to a proton or neutron?

• Much more

• Twice as much

• About the same

• Much less

What is the approximate weight of a proton or neutron in AMU?

• 1 AMU

• 0.0005 AMU

• 10 AMU

• 100 AMU

How do electrons move around the nucleus?

• In a fixed path

• In perfect circles

• Randomly like hyperactive flies

• In straight lines

If the nucleus were the size of a grape, how far would the electrons be?

• A few inches away

• Right next to the nucleus

• A mile away

• A few feet away