Unit 11 Terminology

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Across
  1. 4. An electron pair found in the space between two atoms
  2. 6. The force that holds two atoms together in a compound
  3. 7. A type of bonding in which atoms share electrons.
  4. 9. The angle formed across two adjacent bonds in a molecule
  5. 11. A covalent bond in which the electrons are not shared equally because one atom attracts them more strongly than the other
  6. 13. The tendency of an atom in a molecule to attract shared electrons to itself
  7. 15. The energy required to break a given chemical bond
  8. 16. A substance that contains a mixture of elements and has metallic properties
  9. 17. An alloy formed when some interstices (holes) in a metal lattice are occupied by smaller atoms
  10. 19. The observation that atoms of nonmetals form the most stable molecules when they are surrounded by eight electrons (to fill their valence orbits)
  11. 20. A diagram of a molecule showing how the valence electrons are arranged among the atoms in the molecule
Down
  1. 1. An alloy formed when some metal atoms are replaced by other metal atoms of similar size
  2. 2. the forces of attraction between the free-floating valence electrons (a.k.a. sea of electrons model) and the positively charged metal ions.
  3. 3. A property of a molecule whereby the charge distribution can be represented by a center of positive charge and a center of negative charge
  4. 5. A condition occurring when more than one valid Lewis structure can be written for a particular molecule. The actual electron structure is represented not by any one of the Lewis structures but by the average of all of them
  5. 8. The observation that some molecules form in which the atoms combine in such a way as to have two electrons in their valence shells represented by the following symbol -
  6. 10. A model for metals postulating a regular array of cations in a “sea” of electrons
  7. 12. Electron pairs that are localized on a given atom; electron pairs are not involved in bonding represented by the following symbol :
  8. 14. The attraction between oppositely charged ions.
  9. 18. This model represents the structure around a given atom in a molecule and is determined principally by the tendency to minimize electron-pair repulsions