12.1 TERM SYMBOLS12.2 THE EFFECT OF A LIGAND FIELD – ORBITALS12.3 SYMMETRY LABELS FOR dn CONFIGURATIONS – AN OPENINGTable 12.5 Direct product table for octahedral symmetry12.4 WEAK LIGAND FIELDS, TERMS AND CORRELATION DIAGRAMS12.5 SYMMETRY LABELS FOR dn CONFIGURATIONS – CONCLUSION12.6 SUMMARYPROBLEMS