Unit 6: Chemical Nomenclature - Ionic Compounds with Transition Metals and Polyatomic Ions

Write the formula for these: Sodium Chloride Calcium nitride Barium oxide Iron (III) oxide Sodium phosphate

Transition Metals Where are they found?

Why are they called transition? Have multiple oxidation numbers they transition in between Example: Iron (II) and Iron (III) Fe+2 and Fe+3

Transition metals oxidation numbers: Iron (II) and Iron (III) Fe+2 and Fe+3 The oxidation number is represented by the roman numeral next to the elements name. Number Roman Numeral 1 I 6 VI 2 II 7 VII 3 III 8 VIII 4 IV 9 IX 5 V 10 X

Identify the oxidation numbers of the transition metals: Lead (IV) oxide Cobalt (II) chloride Silver (I) oxide Chromium (VI) nitride Gold (III) sulfide

Writing Formulas for Transition Metals: Manganese (VII) sulfide Cation symbol: _____ Anion symbol:_____

Practice: Gold (III) Oxide Titanium (IV) sulfide Zinc (I) chloride

Writing the names of Ionic Compounds with Transition Metals Just like you write the names of any ionic compound, but you MUST include the OXIDATION NUMBER of the transition metal. This is completed using a roman numeral Iron (III) oxide

Identifying the oxidation number Most of the time it is easily identified, other times it is not. To get the oxidation numbers you simply undrop and unswap Fe2O3 Iron (III) Oxide Use the oxidation number of the nonmetal to check your work. Does it match the periodic table? If yes, you are good to go If no, you will need to unsimplify

MnO2 Example: MnO2 Begin by unswapping and dropping Mn +2 and O -1 What is the oxidation number of oxygen? _____ (according to the periodic table) Does it match (yes or no)? ______ What do we need to do to unsimplify it?

Practice: TiO AgI ZnCl Sn3N2 CrS2

Ionic Compounds with Polyatomic Ions A polyatomic ion is simply a compound with a charge. Poly = many or more than 1 Atomic = atoms Ion = charged atom(s)

Where can I find these? Take a look at the back of your periodic table… Those are you polyatomic ions

Looking at your polyatomic ions what do you notice?

Polyatomics Are treated as single units instead of individual elements The charge of the ion is the oxidation number We cage the beasts Polyatomic ions keep their names The rest of the ionic compound naming rules apply

Can you identify the compounds with polyatomics? Circle the polyatomic ion in the compounds NaCl Co(CO3)2 Li2SO4 CsNO3 MgO Cr3(PO4)2

Naming compounds with polyatomic ions Name the cation *If there is a transition metal make sure to include its oxidation number Name the anion *If it is NOT a polyatomic don’t forget to change the ending to –ide.

Example: Na2(CO3) Mg3(PO4)2 Pb(NO3)2

Writing formulas for compounds with polyatomic ions Calcium Carbonate Ca+2 (CO3)-2 Ca2(CO3)2 Don’t forget to round it to the simplest whole number ratio ________________________

Practice Sodium Chlorate Ammonia phosphate Aluminum Nitrate Chromium (III) cyanide Silver (I) phosphate Ammonia chloride