Ionic Bonding and Ionic
Compounds
6.3
Covalent Compounds
 In covalent bonds, bonds are made
by _______ electrons.
 We use ______
_____________ to depict them.
 In ionic bonds, bonds are made by
___________ electrons.
Ionic Compounds
 Ionic Compounds – composed of +
and – ions that are combined so that
the # of + charges = # of – charges
 Most exist as crystalline solids
+
and – ions that r attracted
Can’t examine individual units like u can
in a molecular cmpd
Ionic Compounds
 Formula represents simplest ratio
that gives electric neutrality
 Formula unit – the simplest
collection of atoms from which an
ionic compound’s formula can be
established
Formation of Ionic Cmpds
.
..
+ + :Cl: Na. + :Cl:

Na
..
..
 In ionic cmpds, to decrease potential
E, they combine in an orderly
arrangement – crystal lattice
 Lattice Energy – the E released when
1 mole of an ionic crystalline cmpd is
formed from gaseous ions
NaCl Crystal Lattice
Compare Ionic and Molecular
Cmpds
(In General)
 Ionic bonds r stronger than covalent
 Ionic cmpds melt and boil at higher
temps
 Ionic cmpds are hard b/c in layers
 In molten state ionic cmpds conduct
electricity
Polyatomic Ions
 A charged group of covalently
bonded atoms
 Bond to other ions ionically
 You will have to memorize several
polys including the name, formula,
and the charge!
Assignment Slide
 Please complete the section review
on page 194 and do numbers 1-5.