1. Atomic Mass Agenda Element Quiz Submit homework Read 4.7 & 4.8 Notes Homework

2. Elements

3. Dev of Atomic Theory

4. How do isotopes differ?

5. How do ions differ?

6. 14 6 C ____ p + ____ e - ____ n o

7. 9 4 Be +2 ____ p + ____ e - ____ n o

8. 36 17 Cl - ____ p + ____ e - ____ n o

9. Homework

10. Element Quiz Flip around the PT so no one can see the symbols When done with the quiz flip it over and draw you favorite Pumpkin!

11. READ Grab book Read section 4.7 & 4.8

12. Average Atomic Mass Date:

13. Determining Average Mass Multiply Mass number by Percent abundance. Add the answers.

14. Example Cesium is 75% 133 Cs, 20% 132 Cs, 5% 134 Cs. What is the average atomic mass?

15. Atomic Mass Unit An amu is the mass of a single proton. 1 amu = 1.67*10 -24 g

16. Example Chromium has four istopes. 4.35% 50 Cr, 83.79% 52 Cr, 9.5% 53 Cr, 2.36% 54 Cr. What is the average atomic mass of Cr?

17. Homework Complete isotopes and average atomic mass