1. WRITING NAMES & FORMULAS FOR POLYATOMIC IONS & RELATED OXYACIDS Textbook Pages: 66 – 67, 69 - 70

2. Polyatomic Ions Definition: A polyatomic ion is a group of atom that stay together and have an overall ionic charge. Example: NO 3 − Nitrate ion ***Refer to the back of your Periodic Table for a list of the Polyatomic Ions!!!

3. The “Standard” Polyatomic Ions There is a special way to name these ion. The following are the most common forms of the ions: The Standards:Polyatomic Ions: ClO 3 - chlorate ion BrO 3 – bromate ion IO 3 - iodate ion NO 3 - nitrate ion SO 4 2− sulphate ion CO 3 2− carbonate ion PO 4 3− phosphate ion ***All “standard” polyatomic ions end in “ate”

4. Altering the Number of Oxygens in Polyatomics 1. If there is one more Oxygen than the standard ion, the ion follows the following pattern: Example:ClO 4 − perchlorate Note: the charge does not change, it stays the same as the standard/original polyatomic ion. per ________ ate

5. If there is one less Oxygen then the standard ion, the ion follows the following pattern: Example: ClO 2 − chlorite Note: the charge does not change, it stays the same as the standard/original polyatomic ion. Altering the Number of Oxygens in Polyatomics ________ ite

6. 3. If there are two less Oxygen than the standard ion, then the ion follows the following pattern: Example: ClO − hypochlorite Note: the charge does not change, it stays the same as the standard/original polyatomic ion. Altering the Number of Oxygens in Polyatomics hypo ________ ite

7. Definition: Oxyacid is an acid composed of hydrogen, oxygen, and atoms of at least one other element. Oxyacids follow the pattern: ic acid Example: HClO 3 Chloric Acid Oxyacids

8. There is a special way to name these acids. The Standards:Oxyacids (Add H + ): Oxyacids HClO 3 chloric acid HBrO 3 bromic acid HIO 3 iodic acid HNO 3 nitric acid H 2 SO 4 sulphuric acid H 2 CO 3 carbonic acid H 3 PO 4 phosphoric acid ***All “standard” oxyacids take the format : ______ ic acid

9. Altering the Number of Oxygens in Oxyacids 1. If there is one more Oxygen that the standard, the acid follows the following pattern: Example: HClO 4 perchloric acid per ________ ic acid

10. 2. If there is one less Oxygen that the standard, the acid follows the following pattern: Example: HClO 2 chlorous acid Altering the Number of Oxygens in Oxyacids ________ ous acid

11. If there are two less Oxygen than the standard, the acid follows the following pattern: Example: HClOhypochlorous acid Altering the Number of Oxygens in Oxyacids hypo ________ ous acid

12. *** Remember: PRACTICE MAKES PERFECT!!!! SO PRACTICE A LOT!!!!!!!!!!