Chemistry Review

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Across
  1. 3. nonmetal+nonmetal; shares electrons
  2. 4. substances that exist before the reaction
  3. 6. contains one atom
  4. 7. metal+nonmetal; atoms transfer electrons
  5. 9. a negative atom; nonmetal
  6. 10. produced by the reactants
  7. 12. ___ energy is necessary to remove an electron from a neutral atom
  8. 17. blocks the effect of the nucleus on the outside layers of electrons
  9. 19. also known as columns or families of the periodic table
  10. 22. energy that is absorbed; reactant side
  11. 23. a measure of the tendency of an atom to attract electrons
  12. 24. has the electron configuration of 1s^22s^22p^4
Down
  1. 1. prefix for nine
  2. 2. metal+metal; includes delocalized electrons
  3. 5. a positive atom; normally metal
  4. 8. H, N, O, F, Cl, and I are the six ___ atoms
  5. 11. the release of heat or energy; on the product side
  6. 13. created first periodic table; ordered them based on mass
  7. 14. smallest unit of matter
  8. 15. the rows of the periodic table
  9. 16. stands for valence shell electron pair repulsion theory
  10. 18. anything that has mass and takes up space
  11. 20. arranged elements by atomic number
  12. 21. contains more than one type of element