Lecture 17 (10am) Chapter 8 October 30, 2009

Lecture 17 (10am) Chapter 8 October 30, 2009 - Remember to...

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Remember to turn your clocks back 1 hour this Saturday night! (Daylight Savings Time ends at 2am Sunday morning)
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Chapter 8 continued Lecture 17 October 30, 2009
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Periodic Trends: Atomic Size
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Main Group Elements: Two opposing influences for Atomic Radius 1.Change in n 2.Change in Z eff
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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 2.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
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Which element will have the largest atomic radius? (A) F (B) S (C) Cu (D) Li (E) K
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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.
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Trends in Ionization Energy 1.Down a group: n value increases (atomic size increases), distance
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This note was uploaded on 10/22/2011 for the course CHEM 1200 taught by Professor Mcintosh during the Spring '08 term at Rensselaer Polytechnic Institute.

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Lecture 17 (10am) Chapter 8 October 30, 2009 - Remember to...

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