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Important Review Material (new). Periodic Table Trends. Atomic Radii- size of the atom Ionic Radii – size of the ion Electronegativity- tendency to attract electrons to itself when chemically combined with another element. Ionization Energy- energy required to remove an electron

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Presentation Transcript
periodic table trends
Periodic Table Trends
  • Atomic Radii- size of the atom
  • Ionic Radii – size of the ion
  • Electronegativity- tendency to attract electrons to itself when chemically combined with another element.
  • Ionization Energy- energy required to remove an electron

first ionization energy - remove 1 electron

second ionization energy - remove 2 electrons

important things that use trends
Important things that use trends
  • Coulomb’s Law
  • Photoelectric Spectroscopy
coulomb s law
Coulomb’s Law
  • Describes the attractions and repulsions between charged particle
  • E = (q1q2)/ r
    • E is potential energy
    • q is charge of ion
    • R is radius
slide7
Like charges, E is positive…when the r increases the E goes down.
    • System goes towards lower potential energy, more distance between particles = lower energy…Like repels like
  • Opposite charges, E is negative…when r decreases the E gets more negative.
    • Lots of attraction
  • Small size and large opposite charges give the best columbic attraction (or lattice energy).
photoelectric spectroscopy
Photoelectric Spectroscopy
  • Plots number of electrons vs ionization energy of the electrons…or how much energy it takes to strip an electron away from an element.
  • You will need to remember electron configuration …1s²2s²
  • S = 2 e- p = 6 e- d= 10 e- f= 14 e-
  • Shells are happy ½ filled or fully filled
  • When electrons are in the same sub orbital e- pair repulsion makes it easier to take away one of the e-.
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