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Naming Covalent Compounds. Writing Covalent Compounds. Made of two anions (2 nonmetals or 1 nonmetal & 1 polyatomic ion) Identify the less electronegative element 1 st (trend = less EN is the one farthest left & farthest down on Periodic Table)
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Writing Covalent Compounds • Made of two anions (2 nonmetals or 1 nonmetal & 1 polyatomic ion) • Identify the less electronegative element 1st (trend = less EN is the one farthest left & farthest down on Periodic Table) • The 1st nonmetal is just given the name as found on the Periodic Table (just like ionic) • The 2nd nonmetal ending is changed to –ide (just like ionic…don’t change polyatomics) • Difference = numerical prefixes are used to express how many of each nonmetal are present
Writing Covalent Compounds (cont.) • You never use “criss-cross” method • The only time you do not use a prefix is when there is only one of the first nonmetal.
Covalent Compound Practice SO2 N2O NO2 CCl4 Cl2O7 PCl3 SF6 Si3N4 N(BrO3)5 H2O Sulfur Dioxide Dinitrogen Monoxide Nitrogen Dioxide Carbon Tetrachloride Dichlorine Heptaoxide Phosphorus Trichloride Sulfur Hexaflouride Trisilicon Tetranitride Nitrogen Pentabromate Water - can use common name
Covalent Compound Practice Phosphorus Trioxide Dinitrogen Pentacarbide Tellurium Noniodide Carbon Monoxide Selenium Heptaflouride Tetraphosphorous Decoxide Arsenic Hexabromide Silicon Dichloride PO3 N2C5 TeI9 CO SeF7 P4O10 AsBr6 SiCl2
