From Serena, Grade three: "What are atoms made of?"

One Possible Answer: Atoms are made up of three different parts: electrons, protons, and neutrons. Protons and neutrons group together in the center of the atom, called the nucleus. Electrons orbit around the nucleus. To find out more about the structure of atoms, look here at a page maintained by chem4kids.

Other questions:

• What makes an atom of helium different from an atom of hydrogen?
• How are atoms combined together to create molecules?
• How many different kinds of atoms are there, and what are their names?