S3 Unit 1 so far

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Across
  1. 4. Reaction which takes in energy
  2. 7. Reaction which gives out energy
  3. 8. no mass
  4. 11. increase the size of this and the reaction goes slower
  5. 12. center of an atom
  6. 15. the number which includes the number of protons and neutrons
  7. 17. a substance which speeds up a reaction, without being used up
  8. 18. potassium is one
Down
  1. 1. this notation allows us to work out the p,e and n
  2. 2. positively charged particle
  3. 3. increase this and the reaction goes faster
  4. 5. no charge found in the center of an atom
  5. 6. group 7
  6. 9. these gases are unreactive
  7. 10. equal number of protons and electrons
  8. 13. the way to work out chemical formula
  9. 14. the number which details the number of protons
  10. 16. these metals are very reactive