This presentation is a brief introduction to the nomenclature topic of naming and writing of binary ionic chemical compounds.

1. Chemistry 101 NoMnClAtURe D. Hamilton, Instructor

2. Chemistry is Elementary What is the name of the chemical in the picture? Objective Naming ionic compounds from formulas Writing formulas from ionic compounds 2

3. Cation Charges

4. Transition Metals Requiring Roman Numerals Transition Metals can form more than one kind of charged ion. Roman Numerals are used to indicate the charge when naming them: Fe2+ iron II ion or ferrous ion Fe3+ iron III ion or ferric ion 4

5. Simple Anion Charges

6. Nomenclature Flow Diagram 6

7. Naming Simple Ionic Compounds Name the compound whose formula is CaCl2 Name the two ions present: Metal cation Nonmetal anion Ca2+Cl1- Name: calcium chloride 7

8. To name the ions present: Remember that metals use the element name nonmetals change end of name to -ide. Name the compound KI. 8

9. Name these simple binary ionic compounds: Li2S Mg3N2 AlI3 CaSe KBr 9

10. Answers: Formula Li2S Mg3N2 AlI3 CaSe KBr Name lithium sulfide magnesium nitride aluminum iodide calcium selenide potassium bromide 10

11. Writing an Ionic Compound’s Formula Step 1: Write ions for elements in the name. Step 2: Balance charges by one of two methods. Step 3: Place subscripts behind each element if needed. Sodium chloride Na1+ Cl1- NaCl 11

12. Balancing Charges I Write the formula for tin (II) fluoride. Step 1: Write the ions Sn2+ and F1-. 12

13. Balancing Charges II Write the formula for tin (II) fluoride. Step 2: How many of each ion will it take to balance the charge electrically? + F1- + F1- 1Sn(2+) + 2F(-1) = 0 13 Sn

14. Balancing Charges III Write a formula for tin (II) fluoride. 1Sn(2+) + 2F(-1) = 0 Step 3: Place subscripts behind each element. SnF2 14

15. Crisscrossing Charges I Write the formula for magnesium nitride. Step 1: Write the ions: Mg2+ and N3- 15

16. Crisscrossing Charges II Write the formula for magnesium nitride. Step 2: Crisscross charges to become subscripts but delete the sign on the charge: Mg2+ N3- Mg3N2 16

17. Crisscrossing Charges III Write the formula for magnesium nitride. Step 3: Check the algebraic sum and complete the formula with subscripts: 3Mg(2+) + 2N(-3) = 0 Mg3N2 17

18. Write a formula for: Lithium oxide Copper (II)sulfide Aluminum selenide

19. Answers: Names Lithium oxide Copper(II) sulfide Aluminum selenide IonsFormula Li1+ O2- Li2O Cu2+ S2- CuS Al3+ Se2- Al2Se3

20. …and now a parting riddle… Two atoms are leaving Blackboard’s EyeOn Cafe. Atom A says to Atom B, “I think I left my electrons inside.” Atom B says, “Are you sure?” “Yes,” Atom A replies. “I’m positive!” Atom B says, “That’s OK, I picked them up!” Who are these two atoms now? 20

21. Credits Creative Commons/Flicker images found on slides 2, 6, 7, 10-12. Retrieved 3:00 PM June 22, 2009 from http://creativecommons.org/ and http://www.flickr.com Graphics on slides 3, 4 from Instructor Resource CD that accompanies Karen Timberlake’s General, Organic, and Biological Chemistry: Structures of Life, 2nd edition, (2007), Pearson Publishing, San Francisco. Slide 16 Cybart image from Microsoft Office 2007 clipart. Riddle adapted from a joke told on National Public Radio original author is unknown. 21