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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? How are atoms split? The atoms of different substances have different numbers of protons. Hydrogen has only one, but uranium has 92. All these protons jostle around, making uranium very unstable. If extra neutrons are fired into the atom's nucleus, they are absorbed. This splits the nucleus in two, releasing energy as heat, and extra neutrons.   Previous: Back Book: Best Ever Q&A Section: Science & Technology Chapter: Atoms & Molecules