Notes #4: Stock System Naming (Ionic Bonds) WNHS Chemistry ***You need your Periodic Table***

USING THE STOCK SYSTEM Today we will be naming and writing formulas for compounds involving the transition metals (d-block) Quiz tomorrow will be on this!

WHY HAVE WE AVOIDED THESE THUS FAR? Transition metals can have more than one stable charge**** Example: CoCl3 vs. CoCl2 Example: Fe2O3 vs. FeS Use the stock system to tell which ion is in the compound!

I II III IV V VI VII VIII STOCK SYSTEM NAMING Roman numerals show the CHARGE of the metal ion (NOT the number of atoms!!!) I II III IV V VI VII VIII Transition Metal Charge Anion Metal Name Name

MBr4 M(CO3)3 M2(SO4)3 M3(PO4)2 “Metal” (IV) Bromide Remember: This is the CHARGE of ONE atom WHAT’S MY CHARGE MBr4 M(CO3)3 M2(SO4)3 M3(PO4)2 “Metal” (IV) Bromide “Metal” (VI) Carbonate “Metal” (III) Sulfate “Metal” (II) Phosphate

BE ABLE TO GO BACKWARDS! :) Ti(NO3)4 Titanium (IV) Nitrate Manganese (IV) Sulfite Iron (II) Nitride Mn(SO3)2 Fe3N2

RULES TO REMEMBER Use this system ONLY for transition metals (d-block) Metals are always POSITIVE (left side of the PT) If you know the negative, you can assign a positive Roman Numerals show the CHARGE of the ion (not the # of atoms) FORMAT → Metal Name (Metal Charge) Anion Name