Chemistry

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Across
  1. 2. A substance at the start of a chemical reaction
  2. 3. Balancing equations ensures the number of these is the same on both sides
  3. 4. The centre of an atom that contains protons and neutrons
  4. 7. The number written in front of a chemical formula when balancing
  5. 8. A type of radiation made of helium nuclei
  6. 9. A positively charged particle in the nucleus
Down
  1. 1. decay The process of unstable atoms giving off energy
  2. 5. A negatively charged particle in an atom
  3. 6. A neutral particle found in the nucleus
  4. 7. The total mass of reactants equals the total mass of products (Law of ______ of mass)