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Ionic Formulas: Monoatomic vs. Polyatomic Ions Lesson

Learn to differentiate between monoatomic and polyatomic ions and write ionic formulas using criss-cross and snap-it methods. Includes warm-up, exploration, explanation, practice, and assessment.

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Ionic Formulas: Monoatomic vs. Polyatomic Ions Lesson

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  1. Monoatomic vs. Polyatomic IonsNaming Ionic Formulas

  2. 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 is an ionic bond? • What are the oxidation numbers of the elements below? • Ca • Po • Ar

  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 • Have a great Thanksgiving break!

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

  8. Watch Ms. Ose’s demo on the board and take notes. Monoatomic vs. Polyatomic Ions

  9. Pass out to students PINK SHEET and POLYATOMIC IONS LIST

  10. Writing Ionic Formulas

  11. Two Methods • Snap-It Together • Criss-Cross Method

  12. Snap-It Together Na1+ Cl1- NaCl

  13. Snap-It Together Practice • Ca2+ O2- • H+ I- • Al3+ P3-

  14. Snap-It Together Answers • CaO • HI • AlP

  15. Criss-Cross Method

  16. Criss-Cross Practice • Mg2+ Cl- • Na+ S2- • Fe3+ O2-

  17. Criss-Cross Answers • MgCl2 • Na2S • Fe2O3

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

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

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