DECEMBER 17, 20131) Bell Ringer: What are

valence electrons? What is the difference between an ionic and molecular compound?

2) Worksheet #133) QUIZ #6

Draw Picture of a sodium and chlorine atom:

Now, draw a picture of a sodium and chlorine ion:

Cations and Anions

Cations are ions with a POSITIVE charge. Anions are ions with a NEGATIVE charge. Draw the funny way to remember cations

and anions:  

Compounds

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:

 

 Empirical Formula

Refers to the ratio of ions in a compound

NaCl has a ratio of 1:1 (1 to 1). MgCl2 has a ratio of 1:2 (1 to 2). AlCl3 has a ratio of 1:3 (1 to 3).

Lewis Dot Structures

Sodium

2) Chlorine

3) Magnesium

4) Oxygen

5) Nitrogen

Oxidation Number

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.

Ionic Combinations

If I combine magnesium and fluorine, what will its empirical formula be?

MgF2

Sodium oxide (Sodium and oxygen) Na2O

  Magnesium oxide MgO

Criss -Cross Method

Lithium oxide

Magnesium oxide

Do on your own right now and then share with a partner.

SHOW YOUR WORK!! The answer is MgO

REACTION OF SODIUM AND CHLORINE

http://www.youtube.com/watch?v=Mx5JJWI2aaw

IONISATION

http://www.youtube.com/watch?v=TStutMsLX2s

QUIZ #6

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?