What is an atom described as in the text?

• The smallest particle that can exist independently

• The largest unit of matter

• A type of molecule

• A compound

Which subatomic particles are found in the nucleus of an atom?

• Electrons and protons

• Neutrons and electrons

• Protons and neutrons

• Protons, neutrons, and electrons

What is the charge of a neutron?

• Positive

• Negative

• No charge

• Variable charge

What can electrons do that protons and neutrons cannot?

• Orbit the nucleus

• Be shared with other atoms to form chemical bonds

• Exist in the nucleus

• Have a positive charge

If an atom's nucleus were the size of a tennis ball, how is the space occupied by the electrons described?

• As small as a tennis ball

• As tall as the Empire State Building

• As wide as a football field

• As large as a small car

A diagram showing the structure of a carbon atom with protons, neutrons, and electrons labeled.

How many elements are currently known, according to the provided material?

• 94

• 118

• 24

• 142

How many of the known elements occur naturally on Earth?

• 94

• 24

• 118

• 142

What does the atomic number of an element tell us?

• The number of neutrons in one atom of that element

• The number of electrons in one atom of that element

• The number of protons in one atom of that element

• The total number of subatomic particles in one atom of that element

What are materials called that are composed of two or more elements?

• Mixtures

• Alloys

• Compounds

• Solutions