Bell Ringer 10-22-09

1. Bell Ringer10-22-09 Atomic number tells the number of _________ and ________. Draw an electron dot diagram for K (Potassium). Draw an electron dot diagram for Br (Bromine). What group is Br in? How many valence electrons does Br have? The period tells the number of ______. The group tells the number of _______. Tell me how many atoms are in this compound. CaCl2 Ca = ___ Cl = ___

2. Ionic Bonding • When atoms form ionic bonds, they transfer electrons. • Gaining electrons • Losing electrons

3. Electron Dot Diagrams • He 5. C • As 6. Al • K 7. Rn • Ba 8. Pb

4. Ionic Bonding Examples • K + F 2. Mg + I 3. Be + S 4. Na + O 5. Al + Br

5. Practice with Compounds • Magnesium Chloride = MgCl3 Mg = ___ Cl = ___ 2. Rubbing Alcohol = C3H8O C = ___ H = ___ O = ___ 3. Zinc Chloride = ZnCl2 Zn = ___ Cl = ___ 4. Aluminum Nitrate = Al(NO3)3 Al = ___ N = ___ O = ___ 5. Six molecules of water = 6H2O H = ___ O = ___

6. Example

9. What groups elements do you think would like to bond with each other based on their charges? • Look at the charges at the top of the periodic table you just created.

10. Groups 1 and 17 • Groups 2 and 16 • Groups 13 and 15 • Those groups whose valence electrons add together to give you 8 (octet rule).

11. Crystal Lab

12. Clean Up • W cup up front and pour it out in the sink • C cup on back table • Salt and Vinegar on side table • Magnifying Glasses up front • Clean your table with a wipe if it needs it • Part of your grade comes from cleaning up!!

13. Exit Quiz10-22-09 • Atomic number tells the number of _________ and ________. • Draw an electron dot diagram for Ca (Calcium). • What group is Ca in? How many valence electrons does Ca have? • The period tells the number of ______. The group tells the number of _______. • Tell me how many atoms are in this compound. H2SO4 H = ___ S = ___ O = ___