1. Wednesday In Science Complete and Go over Chem. Quiz 2 Review Complete Chem. Log 3 Reflection HW: Review for Chem. Quiz 2 By PresenterMedia.comPresenterMedia.com

2. 1. ___________________ are formed by atoms giving away electrons. A. positive ionsC. negative ions B. isotopes D. compounds 2. Which pair of atoms will easily form an ionic bond? A. sodium and potassiumC. fluorine and neon B. potassium and fluorineD. oxygen and carbon Multiple Choice Review Ionic bonds form between metals and non metals So it would be between an element on the left of the stair-step and one on the right… Giving away negatives makes an atom positive

3. 3. The type of bond where non-metallic atoms share electrons is known as a(n): A. metallic bondC. ionic bond B. covalent bondD. none of the above 4. Malleability and good electrical conductivity are characteristics of substances with ________ bonding. A. metallicC. ionic B. covalentD. molecular 5. Small atoms like helium only need a total of ________ valence electron(s) in order to be stable (“happy”). A. oneC. four B. twoD. eight Bonds between 2 non metals (both on the right side of the stair step) are covalent Metal + Non metal = ionic 2 metals = metallic Helium is in group 18 but only has 2 electrons total

4. Similarities Involve valence electrons A force that holds atoms together Form to achieve 8 valence electrons All are types of chemical bonds Differences IonicCovalentMetallic Form between a metal and nonmetal Give and take electrons to make the bond Form between nonmetals Share electrons to make the bond Form between metals Share many electrons with many atoms 7. Compare and contrast ionic, covalent, and metallic bonds. What do they have in similar? What differences do they have? Be specific.

5. Bonds needed for stability NH BrAr OC 8. Draw electron-dot diagrams for each of the following and describe how many covalent bonds it would form in order to be stable. What do the dots represent? 3 1 2 0 1 4

6. 9. Draw an electron-dot diagram for each of the following. a. H 2 Od. NH 3 b. CH 4 e. H 2 IP c. Br 2 f. CH 2 Br 2 :Br : Br: H : P : I : H

7. Element Group Number # of valence electrons Ion formed It hasIt loses or gains Na Br Mg P S 10. Fill in the table with the correct information. 1 2 15 16 17 1 7 2 5 6 Loses 1 Loses 2 Gains 1 Gains 3 Gains 2 Na + Br - Mg 2+ P 3- S 2-

8. 11. Write the correct chemical formula each ionic compound formed between the following elements. Show your work. Be sure to balance the charges and that the metal is listed first. Sodium and phosphorus Na 3 P Sodium and bromine NaBr Magnesium and bromine MgBr 2 Magnesium and phosphorus Mg 3 P 2 Magnesium and sulfur MgS Na + P 3- Na + Br - Mg 2+ Br - Mg 2+ P 3- Mg 2+ S 2-

9. 12. Use an electron dot diagram to predict the chemical formula for the covalent compound that would form if phosphorus and hydrogen were mixed together (assume only two total electrons can be shared). PHPH PH 3