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Choose a Page:What is inside an atom?What happens when molecules are he...How are atoms split?*What is a molecule?*How can we use the energy from atoms?What types of radiation are there? What is a molecule? A molecule is the smallest part of a substance. Its atoms are linked chemically. Two hydrogen atoms and one oxygen atom make a water molecule.   Previous: Back Book: Best Ever Q&A Section: Science & Technology Chapter: Atoms & Molecules