1. 1) Bell Ringer: What are valence electrons? What is the difference between an ionic and molecular compound? 2) Worksheet #13 3) QUIZ #6

4.  Cations are ions with a POSITIVE charge.  Anions are ions with a NEGATIVE charge.  Draw the funny way to remember cations and anions: 

5.  Atoms bonded together with an IONIC bond are called compounds.  An ionic bond is a METAL bonded with a NONMETAL.  Draw the crystal lattice structure for sodium chloride: 

6.  Refers to the ratio of ions in a compound  NaCl has a ratio of 1:1 (1 to 1).  MgCl 2 has a ratio of 1:2 (1 to 2).  AlCl 3 has a ratio of 1:3 (1 to 3).

7.  Sodium

12.  Charge that an atom will have if made into an ion.  Na becomes Na +, so its oxidation number is POSITIVE.  Cl becomes Cl -, so its oxidation number is NEGATIVE.

13.  If I combine magnesium and fluorine, what will its empirical formula be? MgF 2  Sodium oxide (Sodium and oxygen) Na 2 O  Magnesium oxide MgO

14.  Lithium oxide

15.  Do on your own right now and then share with a partner.  SHOW YOUR WORK!!  The answer is MgO

16.  http://www.youtube.com/watch?v=Mx5JJWI 2aaw http://www.youtube.com/watch?v=Mx5JJWI 2aaw

17.  http://www.youtube.com/watch?v=TStutMs LX2s http://www.youtube.com/watch?v=TStutMs LX2s

18.  1) How many valence electrons does Magnesium have?  2) An ionic compound consists of a metal and a _________________.  3) What is the name of an ion that is positive?