1. Science 10 Lesson 2 BOHR MODELS + IONIC BONDING

2. Student Review  Draw a model for sulfur atom

3. Student Practice  Draw a model for argon atom

4. Ions- Atoms with a charge  Atoms become charged when they gain or lose electrons  Gain electrons= more negative  Lose electrons= more positive.

5. Ions  Metals tend to lose Electrons and become positive Cations  Example: Sodium  Non-metals tend to gain electrons, becoming negative anions.  Example: Chlorine

6. Why do ions form?  All elements want a full outer shell= More stable  “They want to be like the Noble Gases”

7. Drawing Bohr models for ions  Same rules, but outer shell either loses or gains electrons  Metals tend to lose, non-metals gain  Ex. Oxygen Ex. Magnesium

8. Student Practice  Draw a model for Phosphorus ion P -3

9. Student Practice  Draw a model for Phosphorus ion P -3

10. Ionic Bonding =Gain and loss of electrons  Metals tend to lose electrons and become positively charged (cations)  Non-metals tend to gain electrons and become negatively charged. (anions)  Elements now attracted, become new compound

12. How to draw Bohr Ionic Bonding.

13. Ionic Bonding Practice  Draw a model for Draw a model for BeO

14. Ionic Bonding Practice  Draw a model for Draw a model for Mg and Cl

15. Ionic Bonding Practice  Draw a model for Mg +2 and Cl -1 2