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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
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
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 = ???
ionization energy continued3
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
review look at the trends
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).
quick assignment
QUICK Assignment
  • Study Guide Workbook: p.43 (10-17)