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Ionic Bonding and Chemical Formula Shortcut

Learn how to determine chemical formula for ionic compounds using the periodic table valence shell and criss-cross shortcut method. Practice naming and forming ionic compounds with examples provided.

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Ionic Bonding and Chemical Formula Shortcut

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  1. Ionic Bonding

  2. Using The Periodic Table Valence Shell: Full = 0 3+ 4± 3– 2– 1– 2+ 1+

  3. Chemical Formula for IonicCompounds Criss-Cross Shortcut • Write the Symbols of the elements with the metal first. • Determine each element’s charge and place that number above the symbol. • Criss-cross the numbers so that they become subscripts for the opposite symbol. • Reduce the subscripts if possible.

  4. Criss-Cross Example • Try Aluminium and Oxygen 2– 3+ Al2O3 O Al 2 3

  5. Naming Ionic Compounds • Name the metal (First symbol in the compound) • Name the non-metal (Second symbol), but change the ending to “ide” • Example: • Potassium mixes with Phosphorus • Potassium Phosphide

  6. Examples • CaBr2 • Calcium Bromide • Na2N • Sodium Nitride • ZnO • Zinc Oxide

  7. Practice

  8. PolyValent Ionic Bonding

  9. What is the chemical formula formed by Copper and Iodine? We don’t know the charge for Copper, so we have to look it up. Refer to your Periodic Table 1– ? I Cu

  10. Atoms that can form more than one type of ion are called Polyvalent. • For example, Copper can form a 2+ ion AND a 1+ ion. • To be able to identify which ion is being used in an ionic compound, we use roman numerals in the middle of the name. • (I), (II), (III), (IV), (V) …

  11. Try Copper and Iodine 1– 1+ CuI I Cu 1 1 Copper (I) Iodide

  12. Try Copper and Iodine 1– 2+ CuI2 I Cu 1 2 Copper (II) Iodide

  13. Practice

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