Chemistry Flashcards Template Page 4
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13Ionic Compounds : Formulas
Guide to Writing Ionic Formulas
compound must have no total charge, therefore
Write the symbol for the metal cation and its charge
1.
we must balance the numbers of cations and
Write the symbol for the nonmetal anion and its charge
2.
anions in a compound to get 0 for a net charge.
Charge (without sign) becomes subscript for other ion
3.
Reduce subscripts to smallest whole number ratio
4.
Check that the sum of the charges of the cation
+
2-
if Na
is combined with S
, you will need 2
5.
cancels the sum of the anions
+
2-
Na
ions for every S
ion to balance the
charges, therefore the formula must be Na
S.
2
Ionic Compounds
Ionic Compounds
Naming Ionic Compounds
Old Exam Question
st
1
Make sure the compound is ionic !!
nd
2
Identify the and name the cation
Metal that forms only one type of cation.
Metal that forms more than one type of cation.
rd
3
Identify and name the anion
Non-metals that form simple anions
th
4
Combine cation and anion names.
Ionic Compounds
Ionic Compounds
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