1. Monoatomic vs. Polyatomic Ions Naming Ionic Formulas

2. Common Core Connection
Objectives
Today I will be able to:
Differentiate between monoatomic and polyatomic ions
Write ionic formulas using the criss-cross and snap-it together methods
Informal assessment – monitoring student interactions and questions as we complete the writing formulas practice
Formal assessment – analyzing responses to the practice and exit ticket
Common Core Connection
Build strong content knowledge
Look for and express regularity in repeated reasoning

3. Lesson Sequence Evaluate: Warm-Up
Explore: Monoatomic vs. Polyatomic Ions
Explain: Writing Ionic Formulas (Snap-it vs. Criss-Cross)
Elaborate: Writing Ionic Formula Practice
Evaluate: Exit Ticket

4. Warm-Up Why do atoms form ions?
What typical charge does the alkaline earth metal family form? What about the halogens?
What is an ionic bond?

5. Objectives Today I will be able to:
Differentiate between monoatomic and polyatomic ions
Write ionic formulas using the criss-cross and snap-it together methods

6. Homework Finish Writing Ionic Formulas Worksheet
Abstract Due Monday, December 9

7. Agenda Warm-Up Oxidation Numbers Monatomic vs. Polyatomic Ions
Writing Ionic Formulas
Snap-It
Criss-Cross
Writing Ionic Formulas Practice
Exit Ticket

8. Oxidation Numbers What are oxidation numbers?
How do we find them for a single element?
Lets review the worksheet
What you know as a ‘charge’ is actually an OXIDATION NUMBER

9. Monoatomic vs. Polyatomic Ions
Watch Mr. Klotz’s demo on the board and take notes.
Pass out pink sheet

10. PINK SHEET
Pass out to students

11. Writing Ionic Formulas

12. Two Methods
1) Snap-It Together
2) Criss-Cross Method

13. Snap-It Together
Na1+ Cl1-
NaCl

14. Snap-It Together Practice
1) Ca2+ O2- 2) H+ I- 3) Al3+ P3-

15. Snap-It Together Answers
CaO HI
AlP

16. Criss-Cross Method

17. Criss-Cross Practice
1) Mg2+ Cl- 2) Na+ S2- 3) Fe3+ O2-

18. Criss-Cross Answers
MgCl2
Na2S
Fe2O3

19. Writing Ionic Formulas Practice
Complete the practice at your desk. Whatever you do not finish will become your homework.

20. Determine what is wrong in the following ionic formula
Exit Ticket
Determine what is wrong in the following ionic formula
Al3Cl