1. Ionic Bonding and Ionic Compounds
6.3

2. In covalent bonds, bonds are made by _______ electrons.
Covalent Compounds
In covalent bonds, bonds are made by _______ electrons.
We use ______ _____________ to depict them.
In ionic bonds, bonds are made by ___________ electrons.

3. 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

4. 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

5. Formation of Ionic Cmpds. ..
Na. + :Cl:  Na+ + :Cl:-
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 .. ..

6. NaCl Crystal Lattice

7. 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

8. A charged group of covalently bonded atoms
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!

9. Please complete the section review on page 194 and do numbers 1-5.
Assignment Slide
Please complete the section review on page 194 and do numbers 1-5.