Lecture 17 Chapter 8 - Remember to turn your clocks back 1...

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Unformatted text preview: Remember to turn your clocks back 1 hour this Saturday night! (Daylight Savings Time ends at 2am Sunday morning) Chapter 8 continued Lecture 17 October 30, 2009 Periodic Trends: Atomic Size Main Group Elements: Two opposing influences for Atomic Radius 1.Change in n 1.Change in Z eff Atomic Size (Atomic Radius) Main Group Elements 1.Down a group, n dominates move down, each atom in the group has one more level of inner electrons to shield the outer electrons 1.Across a period, Z eff dominates electrons added to same outer level (same n value) so inner electron shielding does not change. Outer electrons shield each other poorly, Z eff on outer electrons rises significantly. Transition Elements trends for main group elements do not hold left to right size relatively constant Which element will have the largest atomic radius? (A) F (B) S (C) Cu (D) Li (E) K Periodic Trends: Ionization Energy Ionization Energy (IE) is the energy (in kJ) that is required to completely remove one mole of electrons from one mole of gaseous atoms or ions. Trends in Ionization Energy...
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This note was uploaded on 04/04/2011 for the course CHEM 1100 taught by Professor Mcintosh during the Fall '08 term at Rensselaer Polytechnic Institute.

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Lecture 17 Chapter 8 - Remember to turn your clocks back 1...

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