Module 3: The Atom and Its Structure - Quiz

1. What is the smallest unit of a chemical element that retains its unique properties?

• Molecule
• Cell
• Atom
• Compound

2. Which subatomic particle has a positive charge?

• Electron
• Neutron
• Proton
• Photon

3. Where are neutrons located within an atom?

• Orbiting the nucleus
• In the electron cloud
• In the nucleus
• Outside the atom

4. What determines the atomic number of an element?

• Number of neutrons
• Number of electrons
• Number of protons
• Atomic mass

5. Which subatomic particle is involved in chemical bonding and reactions?

• Proton
• Neutron
• Electron
• Positron

6. What is the dense center of an atom called?

• Electron cloud
• Nucleus
• Proton core
• Atomic center

7. Electrons are found in regions surrounding the nucleus known as:

• Neutron shells
• Energy levels
• Proton orbits
• Atomic layers

8. One Atomic Mass Unit (AMU) is defined as:

• The mass of one proton
• The mass of one neutron
• One twelfth the mass of a carbon-12 atom
• The mass of one electron

9. What is the average mass of an element's atoms, taking into account all its isotopes?

• Atomic Number
• Atomic Mass
• Mass Number
• Isotope Mass

10. Isotopes of an element have the same number of protons but different numbers of:

• Electrons
• Neutrons
• Protons
• Energy levels