2 Atoms Molecules What are the building blocks? Subatomic particles ProtonsElectronss orbitalp orbitald orbitalHybridsCarbonHydrogenOxygenNitrogenPhosphorusChlorineAtomsMethaneFormaldehydeHydrogen cyanidePhosphorus pentachlorideMolecules
11 FORCE & ENERGY N S S N The forces at work are: Electromagnetic: Repulsion of like charges: proton-proton and electron-electron Attraction of unlike charges: proton-electron.Magnetic:Electron spin introduces magnetic forces. Electrons with opposite spins produce opposite magnetic poles. Opposite magnetic poles attract. Opposite spin is required for electrons to occupy the same orbital.NSSN
15 Lewis Structures Keeps track of valence (bonding) electrons Predicts formula for many compoundsPredicts charge of compoundsPredicts stability of compoundsPredicts molecular shape if combined with other theories.nitrate=NO3-
16 Why interest in Molecular Shape? Predicts polar compounds (ones with ends with opposite charges)Predicts solubilityPredicts interaction with light (link)Predicts crystal structureδ-δ-δ+δ-δ+δ-δ-δ-
17 Methane building blocks Lewis StructureVSEPRValence Shell Electron Pair Repulsion
59 Hybridization P O 3- 2 sp 3 sp2 4 sp3 5 sp3d 6 sp3d2 # of electron groupsHybridizationElectron geometry2sp3sp24sp35sp3d6sp3d2StraightTrigonalTetrahedralTrigonal bipyramidalOctahedralTrigonal pyramidalPO3-for P & O
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