energy levels / zero energy level / series metal compounds / metal / metal orbitals / metal-metal bonds / electricity / dxy energy levels / orbital energy level / transition metal cations / d-block transition metal complexes / energy level / average energy / series transition metal compounds / chemical properties / metal ion / complicated chemical formula / Transition metal ions / metal cation results / transition metal series / field stabilization energy / average energy level / electronic energy levels / metal cation / lower energy level / Metal carbonyl cluster compounds / electronic energy / equal energy / metal complexes / metal ions / metal compounds / energy difference / lower energy orbital t2g / energy / called pairing energy / /