Chemistry, Inorganic 4 Rare Earth Elements Sc, Y, La-Lu 2 Chlorides 1 Optical Spectra of Nd, Ce, Pr 1 Sc, Y, La und Lanthanide 1 Sc, Y, La-Lu-Rare Earth Elements 1 Y, La, and the Lanthanoids-Geochemistry-Hydrosphere-Atmosphere-Cosmo- and Geochemical Cycles. Balance 1