2. WELCOME!! 1.Please be in your seats by the time the bell rings. 2.On your catalyst sheet you should be on October 28 th.

3. Sketch and complete the Bohr model for Fluorine. (Start by making your electron shells.) 5 MINUTES CATALYST

4. 4 MINUTES CATALYST Sketch and complete the Bohr model for Fluorine. (Start by making your electron shells.)

5. 3 MINUTES CATALYST

6. Sketch and complete the Bohr model for Fluorine. (Start by making your electron shells.) 2 MINUTES

7. CATALYST Sketch and complete the Bohr model for Fluorine. (Start by making your electron shells.) 1 MINUTE

8. TIME’S UP!!!!!

9. Catalyst Answer Sketch and complete the Bohr model for Fluorine. (Start by making your electron shells.)

10. AGENDA Catalyst Valence Electrons Notes Valence electron sheet

11. ANNOUNCEMENTS 1.See me for help 2.Halloween Chemical Science demos on Friday-don’t miss it!! 3.Did everyone turn in yesterday’s classwork???

12. TODAY’S OBJECTIVE Today you will be introduced to valence electrons and apply them to Bohr models. HS-PS1-2: Create knowledge of reaction based on patterns of properties

13. Recall The atomic number and the number of protons equals---- The number of electrons. How many electrons fill the 1 st orbit? 2 How many fill the 2 nd,3 rd, 4 th orbit, etc.. 8

14. Stability Ideally, a stable atom has eight electrons in its outer shell. These elements with eight stable outside shells are known as the noble gases.

15. Like people, most atoms want to have stability……

18. Valence Electron Outermost electron(s) in an electron’s orbit.

19. Valence electrons are arranged by increasing groups.