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Chemical Bonding

Introduction to Chemistry for Allied Health Sciences Kirk Hunter Chemical Technology Department Texas State Technical College Waco. Chemical Bonding. Predicting Bond Type. Predicting Bond Type. Metallic character of the atoms Electronegativity. Metallic character of the atoms.

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Chemical Bonding

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  1. Introduction to Chemistryfor Allied Health SciencesKirk HunterChemical Technology DepartmentTexas State Technical College Waco

  2. Chemical Bonding

  3. Predicting Bond Type

  4. Predicting Bond Type • Metallic character of the atoms • Electronegativity

  5. Metallic character of the atoms • Metal + nonmetal  Ionic Bond • NaCl – ionic bond • Nonmetal + nonmetal  Covalent Bond • CO2 – covalent bond

  6. TRENDS • The Periodic Table can be used to predict trends. • Atomic radii • Metallic character • Ionization energy (electron affinity)

  7. TRENDSAtomic Radii • Increases down a group • Increases from right to left

  8. Trends Atomic radius increases

  9. Example Which has a larger atomic radius, Na or K? Answer: Potassium, K is below sodium, Na in Group IA. Potassium’s atomic radius is larger.

  10. Trends

  11. Example Which has a larger atomic radius, Ca or Ni? Answer: Calcium, Ca, is to the left of nickel, Ni in Period 4. Calcium’s atomic radius is larger.

  12. Trends

  13. TRENDSMetallic Character • Increases down a group • Increases from right to left

  14. Trends Metallic character increases

  15. Example Which has the most metallic character, Sn or Pb? Answer: Lead, Pb, is below tin, Sn in Group IVA. Lead has more metallic character.

  16. Trends

  17. Example Which has the most metallic character, Ag or Sr? Answer: Strontium, Sr, is to the right of silver, Ag, in Period 5. Stronium has a more metallic character.

  18. Trends

  19. TRENDSElectronegativity(Electron Affinity) • Increase – bottom to top of Group • Increase – left to right in Period

  20. Trends Electronegativity increases (Electron affinity)

  21. TRENDSIonization Energy

  22. Example Which has a higher ionization energy (electronegativity), Li or Na? Answer: Lithium is above sodium in Group IA. Lithium has a higher ionization energy (electronegativity).

  23. Example Which has a higher ionization energy (electronegativity), N or O? Answer: Oxygen is to the right of nitrogen in Period 2. Oxygen has a higher ionization energy (electronegativity).

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