Ionic Bonding & Ionic Compounds
    A.
  ____________________: composed of + and - ions whose charges cancel each other
         out;  electrons are _______________
        1.  Most exist as ____________________
        2.
  __________ network of + and - ions;  not composed of individual units
    B.  Formation of Ionic Compounds
                           .
.
        1.  Na .  +  : Cl :  --> 
                            .
   
      2.  Characteristics of Ionic Bonding
            a.  minimize P.E. by organizing into _______________
            b.  ____________________: energy released when 1 mole of ionic crystalline cmpd.
                 is formed from gaseous ions  

IONIC VS. COVALENT (MOLECULAR) COMPOUNDS

Ionic Compounds                                                   Covalent (Molecular) Compounds
~ formed by transferring electrons                          ~ formed by sharing electrons
~ occurs between positive and negative                   ~ occurs between nonmetals
    ions (metal & nonmetal or metal &   
    polyatomic ion)
~ smallest unit = "formula unit"                              ~ smallest unit = "molecule"
~ exist as solids, usually crystal shape                      ~ exist as liquids, gases, or non-crystal
                                                                                solids
~ have high melting points                                      ~ have low melting points
~ most dissolve in water                                         ~ few dissolve in water
~ melted or dissolved in water conduct                     ~ melted or dissolved in water does not
    electricity                                                               conduct electricity
~ fixed + and - parts;  anions & cations                    ~ may have slightly + and - parts or
                                                                                totally neutral
~ EXAMPLES:  KCl, NaF, KNO3                                ~ EXAMPLES:  NH3, CO2, CH4

Polyatomic Ions
    1.
  ____________________: charged group of covalently bonded atoms
    2.  Combine with ions of _______________ charge to form ionic compounds
    3.  Compounds with polyatomic ions have ____________________________ bonding
    4.  Lewis Structures
        a.
  Negatively charged polyatomic ion = _____ e- to total number of valence e- for cmpd
        b.  Positively charged polyatomic ion = ________ e- from total # of valence e- for cmpd

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