3. Naming Ionic Compounds – questions to ask

4. Polyatomic Ions
Page 202

5. What are they?
An ion consisting of a stable group of atoms acting together as a single charged particle
Most are anions; exception is the ammonium cation
Do not form binary compounds
See table 1 page 202 for common polyatomic ions

6. How are they named? Cation is named first
Polyatomic ion named as a unit, not individual atoms
Check to see if metal is polyvalent when naming

7. Practice
What is the name of the compound Na2CO3?
Sodium Carbonate

8. Practice
What is the name of the compound
Fe(NO3)3?
Iron (III) nitrate

9. Practice
What is the name of the compound
CuSO4?
Copper (II) sulfate

10. Practice
What is the name of the compound
Ca(OH) 2?
Calcium hydroxide

11. Practice What is the chemical formula of sodium
phosphate? (use the criss-cross method)
Na PO4
Na3PO4

12. Practice What is the chemical formula for copper (II) nitrate?
Cu(NO3)2

13. Practice What is the chemical formula for Ammonium carbonate?
(NH4)2CO3

14. (uranium)(selenium) (yttrium)(erbium) (boron)(radium)(iodine)(nitrogen)
Worksheet – Nomenclature
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