The refractive index of \(\mathrm{CH}_{2} \mathrm{I}_{2}\) is 1.732 for 656 nm light. Its mass density at \(20^{\circ} \mathrm{C}\) is \(3.32 \mathrm{~g} \mathrm{~cm}^{-3}\). Calculate the polarizability of the molecule at this wavelength.

Text Transcription:

CH_2 I_2

20^circ C

3.32 g cm^-3

ElectronConfigurationsofCationsandAnionofRepresentativeElements • Atomsloseelectronssothatcationhasanoble-gasouterelectronconfiguration • Atomsgainelectronssothatanionhasanoble-gasouterelectronconfiguration • Isoelectronic:havethesamenumberofelectrons,andhencethesameground-state electronconfiguration ElectronConfigurationsofCationsofTransitionMetals • Whenacationisformedfromanatomofatransitionmetal,electronsarealways removedfirstfromthensorbitalandthenfromthe(n–1)dorbitals AtomicRadii • Cationisalwayssmallerthanatomfromwhichitisformed • Anionisalwayslargerthanatomfromwhichitisformed • Ionizationenergy:theminimumenergy(kJ/mol)requiredtoremoveanelectronfroma gaseousatominitsgroundstate TheElements • Group1AElements(ns ,n³2) 2 • Group2AElements(ns ,2³12) • Group3AElements(ns np ,n³2) • Group4AElements(ns np ,n³2) 2 3 • Group5AElements(ns np ,n³2) • Group6AElements(ns np ,n³2) 2 5 • Group7AElements(ns np2,6³2) • Group8AElements(ns np ,n³2) o Containscompletelyfillednsandnpsubshells o Highestionizationenergyofallelements o Notendencytoacceptextraelectrons