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Atoms

• Which is larger/smaller, an atom, a molecule, a proton, a neutron, an electron?
• How large are atoms?
• What particles are inside an atom?
• What particles are inside an atom's nucleus?
• Why do protons and neutrons stick together inside an atom's nucleus (and not repel each other)?
• How many different kinds of fundamental forces are there in nature?
• Where are the electrons in an atom?
• Do electrons that are in atoms move in circles around the nuclei?
• How many electrons does a neutral hydrogen atom have?
• How many electrons does a neutral helium atom have?
• What are isotopes?
• What are ions?
• Under what conditions do atoms become ions?
• Are the values of an electron's energy in an atom restricted?
• What happens inside an atom when a photon of light is emitted/absorbed?

Molecules

• What is a molecule?
• Why can a molecule gain or lose energy in more ways than an atom?

Bulk Matter

• Why does matter solidify when cooled down, and not when heated up?
• In terms of atoms, what is the difference between liquids and gases?
• What is a plasma?
• In a plasma, would you expect the atoms to become positive or negative ions?