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Ionization Energy

Ionization Energy. What is “ionization energy”? Answer: the energy required to remove an electron from a gaseous atom This means that energy is required to form positive ions. Energy is released when a negative ion is formed. . Ionization Energy (continued). Examples:

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Ionization Energy

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  1. Ionization Energy • What is “ionization energy”? Answer: the energy required to remove an electron from a gaseous atom • This means that energy is required to form positive ions. • Energy is released when a negative ion is formed.

  2. Ionization Energy (continued) • Examples: • Na + ionization energy → Na+ + e- • Cl + e- → Cl- + energy • Positive ions don’t have special names, but negative ions have their endings changed to –ide. • Oxygen ion = oxide • Nitrogen ion = ?? • Chlorine ion = ???

  3. Ionization Energy (continued) • Some Practice for you . For the following elements, write the formula for its ion formation and energy absorbed or released, and name the ion: • Cesium • Magnesium • Aluminum • Carbon • Astatine • Oxygen • Bromine

  4. Review & Look at the Trends • Why do atoms gain or lose electrons? Answer: to obtain a full octet of electrons in its outer valence orbital (like the noble gases have) • What is the oxidation number of calcium? Answer: +2 • Is calcium a cation or an anion? • As a rule, metals form cations (+ ions), and nonmetals form anions (- ions).

  5. QUICK Assignment • Study Guide Workbook: p.43 (10-17)

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