Atoms, Compounds and Chemical Equations

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Across
  1. 1. negative charge
  2. 4. circular path of particles
  3. 6. positive particle
  4. 7. Reactions exiting energy
  5. 10. negative particle
  6. 13. positive charge
  7. 14. it's never free of charge
  8. 17. Reactions entering entering
  9. 19. Table tables of elements
  10. 20. column
Down
  1. 2. form of an atom
  2. 3. periodic table item
  3. 5. Electron electrons on the final shell
  4. 8. balance
  5. 9. Bond sharing electrons
  6. 11. in an element
  7. 12. Bond transfer of valence electrons
  8. 15. consisting of several parts
  9. 16. row
  10. 18. neutral particle