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Presentation6_061004

Presentation6_061004 - Chem 6A Presentation#6 Overview...

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Chem 6A Presentation #6 2006-10-04 1 Overview Chapter 1: The Quantum World Periodic trends in atomic properties Fundamentals C: Introduction to compounds
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2 Periodic trends in atomic properties: Atomic size (radius) Defining atomic size (radius) depends on the type of element.
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3 Periodic trends in atomic properties: Atomic size (radius) Across period: Z eff dominates Down group: n dominates
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4 Periodic trends in atomic properties: Atomic size (radius) .
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5 Ionization energy Ionization energy ( IE ) is the energy required to completely remove 1 mole of electrons from 1 mole of gaseous atoms (or ions). The first ionization energy (IE 1 , also I 1 ) is the energy required to remove the outermost electrons from gaseous atoms: atom (g) ion + (g) + e E = IE 1 > 0 Successive ionization energies (IE 2 ,IE 3 , etc.) are required to remove additional electrons from ions. ion + (g) ion 2+ (g) + e ∆E = IE 2 > IE 1
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6 Periodic trend in 1 st ionization energy (IE 1 ) Main-group elements: Across period: Z eff increases and size decreases, so e is harder to remove.
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