Atomic Structure

Open Ended

Why is understanding atomic structure considered fundamental to the study of chemistry?

Multiple Choice

Which of the following best describes an element?

• A pure substance made of one type of atom

• The smallest unit of matter

• Anything that has mass and occupies space

• A mixture of different atoms

Multiple Choice

Which subatomic particle determines the identity (atomic number) of an element?

• Proton

• Neutron

• Electron

• Nucleus

Multiple Select

Which of the following statements about the atomic nucleus are correct?

• It contains protons and neutrons.

• It occupies most of the atom's volume.

• It contains over 99.9% of the atom's mass.

• It is held together by the strong nuclear force.

Open Ended

Describe how the arrangement of electrons in energy levels influences the chemical properties of an atom.

Open Ended

Explain how isotopes of the same element can have different physical properties even though they have the same number of protons.

Multiple Choice

What happens to an atom when it gains one or more electrons?

• It becomes a cation.

• It becomes an anion.

• It becomes neutral.

• It loses protons.

Open Ended

How do atoms, elements, and matter relate to each other in the context of the basic units of matter?