1. We’ll go over this example in video form.

2. We’re asked to name the compound with the formula Au, NO 3 in brackets, 3. Name the compound with the formula Au(NO 3 ) 3

3. We see that Au(NO 3 ) 3 has 3 elements (click) gold, nitrogen, and oxygen. Any ionic compound with more than two elements must contain a polyatomic ion. Au(NO 3 ) 3 3 Elements Name the compound with the formula Au(NO 3 ) 3

4. So we look for polyatomic ions in the formula Au(NO 3 ) 3 Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

5. NO3 comes from (click) the nitrate ion, NO3 minus. Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

6. Gold is a singe metal but its not on the Positive Ion section of the table here. Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

7. But it is found here, quite low in the middle section of the periodic table Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

8. We can start writing the name: the metal is (click) gold, and the polyatomic ion is (click) nitrate Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – gold(III) nitrate

9. Because gold has more than one possible charge we have to indicate the charge (click) with a roman numeral Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – gold(III) nitrate roman numeral

10. Is the charge positive 3 or positive 1 and (click) what is the roman numeral? Here’s how we find the charge on gold… Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – gold(III) nitrate roman numeral ? ? ?

11. The formula tells us we have one gold ion Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 –

12. And 3 nitrate ions. Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 –

13. Each nitrate ion has a charge of negative 1, so the total negative charge is 3 times negative 1, (click) which is negative 3 Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

14. The positive and negative charges (click) must be balanced. Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

15. So the total positive charge must be positive 3. There is only one gold ion, Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

16. So the charge on this gold ion (click) must be positive 3 Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

17. The roman numeral represents the charge on one gold ion, so (click) the roman numeral is, (click) Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3 gold(III) nitrate ?

18. 3 Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3 gold(III) nitrate

19. So the name of this compound is gold (III) nitrate. Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3 gold(III) nitrate Name

20. So the final answer is (click) the name of this compound is gold (III) nitrate. Name the compound with the formula Au(NO 3 ) 3 gold(III) nitrate