Solids_1 - Read Chapter 16 Sections 16.1 and 16.2 Exam II...

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Read Chapter 16 – Sections 16.1 and 16.2 Exam II – April 22 Final Exam: May 8 th  5 – 8pm
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Ionic Bonding (Large Differences in Electronegativity) Solid-State Chemistry and Materials Tables of Ionic Radii: Pauling (1928), Goldschmidt (1927) ‘Recent’ (more accurate) Compilation: Shannon and Prewitt (1969, 1970) General Assumptions 1. Ions are essentially spherical 2. Ions are composed of two parts: (a) Central Core – where most of the electron density is concentrated and (b) Outer Sphere – which contains very little electron density. 3. Assignment of ionic radii is difficult, since it is not always obvious where central core ends and outer sphere begins. Central Core Outer Sphere
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Important Trends For s- and p-block elements, the ionic radii increases with atomic number for any vertical group with similar coordination. 6 coordinate Rb +  > 6 coordinate K +  > 6 coordinate Na + For any iso-electronic series of cations, the radius  decreases  with increasing  charge.
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