Naming Rules
1. Binary Ionic Compounds: The metal name goes first, then the nonmetal name goes last
modified by –ide. Be sure to check to see if the metal is from Group A or B. If it is from Group
B it needs a Stock System or Classical name for the charge of the cation. Note that in Group B,
silver (Ag+1), Cadmium (Cd+2), and Zinc (Zn+2) always have the one charge shown here with
their symbol and do not need a Stock System or Classical name. In addition, two Group A metals
have more than one charge and will need a Stock System or Classical name. Those are tin (Sn)
and lead (Pb) and both can have either a +2 or +4 charge.
2. Binary Molecular Compounds: First nonmetal name goes first with no change and second
nonmetal name goes last modified by –ide. Prefixes are used to indicate the number of atoms
present. The exception is that the first element in the compound does not need the prefix monowhen there is only one atom of that element in the compound. Also, remember that you do not
have to balance the charge for this type compound. The prefixes used to indicate the number of
atoms present are the Greek prefixes and are mono-1, di-2, tri-3, tetra-4, penta-5, hexa-6, hepta7, octa-8, nona-9, and deca-10.
3. Ternary: Metal or positive polyatomic ion goes first, the nonmetal or negative polyatomic ion
goes last and no names are changed and no prefixes are used. When naming the metal, be sure to
check to see if it needs a Stock System or Classical name.
4. Acid Type I: In this acid, the H+1 ion is joined with an anion that has a name that ends with the
suffix –ide. To name this acid, drop the –ide suffix and add the prefix hydro- and suffix –ic to the
stem name from the anion and then the word acid. The pattern looks like this: hydro-(stem)-ic
acid. An example would be HCl which is named hydrochloric acid.
5. Acid Type II: In this acid, H+1 ion is joined to a negative polyatomic ion that has a name that
ends with the suffix –ite. Drop the –ite suffix and add the suffix –ous to the stem of the
polyatomic ion name. The pattern looks like this: (stem)-ous acid. An example would be when
hydrogen (H+) joins with nitrite (NO2-1), the name would be nitrous acid.
6. Acid Type III: In this acid, H+1 ion is joined to a negative polyatomic ion that has a name that
ends with the suffix –ate. Drop the –ate suffix and add the suffix –ic to the stem of the
polyatomic ion name. The pattern looks like this: (stem)-ic acid. An example would be when
hydrogen (H+) joins with nitrate (NO3-1), the name would be nitric acid.
Mole Chart
(6.02x1023)
(22.4 L)
particles-----moles------volume
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Formula
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|Periodic Table
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POP
mass