Chem 115 1nd Edition Lecture 25Outline of Last LectureI. Trends in Atomic SizeII. Trends in Ionization EnergyIII. Trends in Electron AffinityIV. Behavior Patterns for IE and EAV. Metallic BehaviorOutline of Current LectureI. Magnetic Properties of Transitional Metal IonsII. Ionic Size vs. Atomic SizeIII. Models for Chemical BondingIV. Periodic Trend in Lattice EnergyV. Properties of Ionic CompoundsCurrent LectureMagnetic Properties of Transition Metal Ions- Paramagnetism: one or more unpaired electrons attracted by a magnetic field- Diamagnetism: paired electronsIonic Size vs. Atomic Size- Cation are smaller than parent atoms- Anions are larger than parent atoms- Ionic radius increase down a group- Cation size decrease as charge increases Models for Chemical Bonding- ionic bondtransfer of electrons (metal + nonmetal)- covalent bondsharing of electrons (nonmetal + nonmetal)- metallic bondelectron pooling, malleable (metal + metal)Periodic Trend in Lattice EnergyThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Lattice energy: energy required to separate 1 mole of ionic solid into gaseous ions (measure of strength in ionic bond)- Colomb’s Law electrostatic energy (charge A)(charge B)distance electrostatic energy (cation charge) (anion charge) cation radius + anion radius- Affected by ionic size and charge- Ionic size increase as lattice energy decreases- Ionic charge increase as lattice energy increasesProperties of Ionic Compounds- Hard- Rigid- Brittle- High melting point- Don’t conduct
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