Monoatomic vs. Polyatomic Ions Naming Ionic Formulas

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

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

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?

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

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

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

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

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

PINK SHEET Pass out to students

Writing Ionic Formulas

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

Snap-It Together Na1+ Cl1- NaCl

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

Snap-It Together Answers CaO HI AlP

Criss-Cross Method

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

Criss-Cross Answers MgCl2 Na2S Fe2O3

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

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