BINARY COMPOUNDS WHEN TWO ELEMENTS MEET MOST ALL ELEMENTS HOLD SOME KIND OF CHARGE YOU NEED TO KNOW THESE! +1 +2 -3 -2 -1 HOW TO WRITE A CHEMICAL FORMULA 1. Find the charges of each element from their placement on the periodic table.
2. Write the chemicals with their charges next to each other. 3. Take the charge of the first element and make it the subscript of the second, and take the charge of the second element and make it the subscript of the first. (Ignore negative and positive in this step!) 4. If the new subscripts have a common multiple, divide by that multiple. WRITING A FORMULA EXAMPLE Write the formula for the ionic compound that will form between Ba and Cl. 1. Find the charges of each element from their placement on the periodic table. Ba has a +2 charge and Cl has a -1 charge
2. Write the chemicals with their charges next to each other. Ba2+ Cl1- 3. Take the charge of the first element and make it the subscript of the second, and take the charge of the second element and make it the subscript of the first. (Ignore negative and positive in this step!) Ba2+ Cl1-
4. If the new subscripts have a common multiple, divide by that multiple. Final formula: BaCl2 DO THESE EXAMPLES 1.Na, S 2.Al, Cl 3.Mg, N SOLUTION
1.Na, S Na2S 2.Al, Cl AlCl3 3.Mg, N Mg3N2 NAMING COMPOUNDS
Binary Ionic Compounds 1. Cation first, then anion 2. Monatomic cation = name of element ex: Ca2+ = calcium 3. Monatomic anion = root + -ide ex: Cl1- = chloride CaCl2 = calcium chloride DO THESE EXAMPLES 1.NaCl 2.ZnI2 3.Al2O3
SOLUTION 1.NaCl Sodium Chloride 2.ZnI2 Zinc Iodide 3.Al2O3 Aluminum Oxide TRANSITION METALS **A SPECIAL CASE** Transition metals can have more than one possible charge, and MUST have a Roman Numeral to indicate the charge on the individual ion 1+ or 2+
2+ or 3+ Cu+, Cu2+ Fe2+, Fe3+ copper(I) ion iron(II) ion copper (II) ion
iron(III) ion HOW DO I KNOW WHICH ELEMENTS NEED A ROMAN NUMERAL? ANY METAL EXCEPT GROUPS 1A, 2A, Ag, Zn, Cd, and Al (You should know the charges of these elements already!) Examples: FeCl3 CuCl SnF4 (Fe3+)
iron (III) chloride (Cu+ ) copper (I) chloride (Sn4+) tin (IV) fluoride PbCl2 (Pb2+) lead (II) chloride Fe2S3
(Fe3+) iron (III) sulfide LEARNING CHECK Complete the names of the following binary compounds with variable metal ions: FeBr2 iron (_____) bromide CuCl
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