The Chemical Context of Life

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Across
  1. 3. negative electricity
  2. 10. breaks down formula
  3. 11. positive electrons
  4. 14. atoms attract shared electrons
  5. 17. electrons share atoms
  6. 18. an substance that has mass
  7. 19. species of atoms
  8. 20. positively charged ion
  9. 21. attraction between atoms, ions, or molecules
  10. 22. natural gas
  11. 23. two or more elements
  12. 24. outer shell
Down
  1. 1. undergoes change during a reaction
  2. 2. a group of atoms bonded together
  3. 4. sharing electrons between two atoms
  4. 5. same element different neutrons
  5. 6. species formed by chemical reactions
  6. 7. basic unit of a chemical element
  7. 8. energy stored in chemical bonds
  8. 9. atom or molecule
  9. 12. negatively-charged ion
  10. 13. atoms come close together
  11. 14. released after chemical reaction
  12. 15. reversible chemical reaction
  13. 16. attraction between opposed ions