Unit 5 5 basic ionic nomenclature
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Ionic compounds are named by combining the name of the metal cation and non-metal anion. The non-metal name ends in "-ide". For example, sodium nitride is named Na3N, not trisodium nitride. To write formulas from names, determine the ion charges and balance them. Some students incorrectly add prefixes like "tri-" instead of just writing the compound name. Practice naming and writing formulas of common ionic compounds to build skills in basic ionic nomenclature.
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Unit 5 5 basic ionic nomenclature
- 2. Purpose • Now that we know what ions are and how to combine ions to make compounds, we need to know how to properly name them.
- 3. Naming ionic compounds • Ionic compounds are simply a combination of the name of the metal and the name of the non-metal ion ending in –ide – Example: Combination of Na+ and N3- ion. • Formula = Na3N • Name = sodium nitride
- 4. Misconception alert • Some students want to name Na3N trisodium nitride or some other variation. For ionic compounds, we do not use prefixes such as tri-. They are unnecessary. Na3N is simply sodium nitride.
- 5. Ionic compounds from names • When generating an ionic compound from a name it is important to always remember to first determine the charges of the ions, then balance them out as you did in the previous lesson. – e.g. Calcium phosphide • Ions: Ca2+ and P3- • Formula to balance charges: Ca3P2
- 6. Pause and Practice • What are the names of the following ionic compounds? – Li2S – CaCl2 • What are the formulas of the following ionic compounds? – Magnesium oxide – Potassium nitride
- 7. Pause and Practice • What are the names of the following ionic compounds? – Li2S – lithium sulfide – CaCl2 – calcium chloride • What are the formulas of the following ionic compounds? – Magnesium oxide • Mg2+ and O2- • MgO – Potassium nitride • K+ and N3- • K3N