Unit 4

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Across
  1. 2. molecule that contain two atoms of the same element.
  2. 4. Three shared pairs of electrons.
  3. 7. are compound of two elements.
  4. 9. group of atoms with a positive or negative charge.
  5. 10. electrons are not shared equally.
  6. 12. are ionic compounds that produce hydroxide ions when dissolved in water.
  7. 13. two shared pairs of electrons.
  8. 15. electrons are shared equally.
  9. 16. repulsion between electron pairs causes molecular shapes to adjust so valence-electron pairs stay far apart.
  10. 17. not shared between atoms.
Down
  1. 1. Sharing of electrons
  2. 3. composed of two nonmetals.
  3. 5. energy required to break the bond between two covalently bonded atoms.
  4. 6. attractions between molecules.
  5. 8. one pair of electrons.
  6. 11. neutral groups of atoms held together by covalent bonds.
  7. 14. are compounds that contain one or more hydrogen atoms and produce hydrogen ions when dissolved in water.