1. Naming Covalent Compounds Objectives: 1.The name for covalent compounds with given formula 2.Give a formula for covalent compounds with given name

2. Covalent Cmpds Made of 2 anions (2 negatively charged ions) Identify the less EN element of the two (left and down— decreases) The 1 st nonmetal is given the name on the PT The second changes the ending to –ide…don’t change polyatomic Never use “criss-cross” to balance Use prefixes to show how many of each element are need

3. Number Prefix 1 Mono 2 Di 3 Tri 4 Tetra 5 Penta 6 Hexa 7 Hepta 8 Octa 9 Nona 10 Deca

4. Using prefixes Never use if the first element only has one

5. Practice SO 2 sulfur dioxide N2ON2O dinitrogen monoxide NO 2 nitrogen dioxide CCl 4 carbon tetrachloride Cl 2 O 7 dichlorine heptaoxide PCl 3 phosphorus trichloride SF 6 sulfur hexafluoride Si 3 N 4 trisilicon tetranitride N(BrO 3 ) 5 nitrogen pentabromate H2OH2O water

6. Phosphorus trioxide Dinitrogen pentacarbide Tellurium noniodide Carbon monoxide Selenium heptafluoride Tetraphosphorous decoxide Arsenic hexabromide Silicon dichloride

7. PO 3 N 2 C 5 TeI 9 CO SeF 7 P 4 O 10 AsBr 6 SiCl 2