Compounds Made From Only Two Elements
- Write the name of the positive ion (same as the name of the element with positive oxidation number)
- If the ion can have more than one oxidation state (mainly transition elements), designate the oxidation state with a Roman numeral in parentheses.
- Remember that the Roman numeral represents the oxidation number not the subscript for that element in the compound.
- for example, FeO is Iron (II) Oxide, while Fe2O3 is Iron (III) oxide
- write the name of the negative ion
- this will be the element with an -ide ending (example: iodine beomes iodide, oxygen becomes oxide, etc.)
- That's it !!!
- Al2S3
- CrO
- PbO
- PbO2
- the compound will still have only two words in its name
- You'll know you have a polyatomic ion present if more than two elements are in the formula
- the first word represents the positive ion (element or polyatomic ion)
- the second word represents the negative ion
- if the negative ion is a polyatomic ion, do not change the ending!!!
- Hints
- Divide the compound into a positive and a negative part
- If only the Positive ion is polyatomic
- the first word is the name of the positive polyatomic ion
- the second word will have an ide ending
- If only the negative ion is Polyatomic
- the first word will be the name of the first symbol
- Remenber to use Roman numerals, if necessary
- the second word will be the name of the polyatomic ion (no changes in the ending)
- the first word will be the name of the first symbol
- if both the positive and the negative ions are polyatomic ions
- the easiest yet
- the first word is the name of the positive polyatomic
- the second word is the name of the second polyatomic
- If only the Positive ion is polyatomic
- That's it!!!
- Divide the compound into a positive and a negative part
- When naming binary compounds, simply follow these steps:
Try these
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