Solid State-Chemistry Exclusiove 2 Pg Notes In Chart Format

CRYSTAL SYSTEMAXIAL DISTANCEAXIAL ANGLEUNIT CELL (BRAVIS LATTICE)CUBIC a = b = ca = B = Y = 900SC BCC FCCRHOMBOHEDRALa = b = ca = B =/= YSCTETRAGONAL a = b =/= ca = B =/= Y SC BCCHEXAGONALa = b =/= ca = B = 900 SCORTHORHOMBICa =/= b =/= ca = B = Y = 900SC BCC FCC ECMONOCLINICa =/= b =/= ca = Y = 900, B =/= 900SC ECTRICLINICa =/= b =/= ca =/= B =/= Y =/= 900SC [MOST UNSYMMETRICAL]TYPE OF SOLIDPARTICLESBONDINGPHYSICAL NATUREELECTRIC CONDUCTIVITYMPEXAMPLES1.MOLECULARMolecules (i)non polarDispersion/London SoftInsulators(Low)2Ar,CCl4,H2,I2,CO2 (ii)polarDipole-dipoleSoftInsulatorsLowHCl, SO2 (iii) hydrogenHydrogen bondHardInsulatorsLowH2O (ice)2.IONICIonsCoulombicHard but brittleSolid-InsulatorMolten/aq- ConductorHighNaCl, MgO, ZnS. CaF22.METALLIC+ve ions in sea of free e-Metallic bondHard but malleable & ductileSolid & Molten – ConductorFairly highFe, Cu, Ag, Mg3.NETWORKAtomsCovalent bondHardSOFTInsulatorCONDUCTOR(High)2 SiO2(quartz), SiC, C(diamond), AlNC(graphite)FACTORSSIMPLE CUBICBCCFCCSHARING OF ATOMS1/8 of 8 corners1/8 of 8 corners + 1 body centre1/8 of 8 corners + 6 face centreZeff8 x 1/8 = 18 x 1/8 + 1 x 1 = 21/8 x 8 + ½ x 6