PERIODIC TRENDS - PowerPoint PPT Presentation

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PERIODIC TRENDS

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PERIODIC TRENDS. Atomic size. Ionization energy ... Putting Trend to Use ... 1st IE of Mg = 738 kJ/mol. 2nd IE of Mg = 1450 kJ/mol. 3rd IE of Mg = 7734 kJ/mol ... – PowerPoint PPT presentation

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Title: PERIODIC TRENDS


1
PERIODIC TRENDS
  • Atomic size
  • Ionization energy

2
Atomic Size
  • For the main group elements (s p blocks),
    atomic radii increase going down a group and
    decrease from left to right across a period.

3
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4
Putting Trend to Use
  • Using the periodic table, arrange the following
    in order of increasing atomic radius
  • Br, Te, Se

5
Ionization energy, IE, is the amount of
energy required to remove an electron from an
isolated, gas phase atom.
  • Energy is always required for this process.
  • IE generally decreases going down a group
  • and generally increases from left to right
  • across a period.

6
Electron Affinity
  • Energy released when a lone, gaseous atom gains
    an electron.
  • F e- ? F-

7
Electron Affinity, EA, is the amount of energy
released when a free, gas phase atom gains an
electron.
EA increases (i.e., more energy is released) as
we move to the top and right of the periodic
table.
8
Removing Multiple Electrons from an Atom
  • 1st IE of Mg 738 kJ/mol
  • 2nd IE of Mg 1450 kJ/mol
  • 3rd IE of Mg 7734 kJ/mol
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