8. II. Ionic compounds 4. Salts such as NaCl form crystals a. Crystals = solids w/ repeating patterns (“crystal lattice”)held together by electrostatic attractions
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15. II. Steps for Drawing Lewis Structures D. Some General Guidelines 1. Often the central atom is the first one in the formula 2. Carbon likes to be in the middle with four bonds around it 3. Halogens like to be on ends with only one bond 4. Hydrogen MUST be on an end 5. Oxygen likes two bonds
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24. Ionization Energy & the Periodic Table Elements with the highest ionization energies occur in the upper right corner (most chemically active nonmetals) Elements with the lowest ionization energies are in the lower left corner of the table (most chemically active metals)
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27. III. Atomic Size & the P.T. Size is decreasing Size is decreasing