ASAP The complex ions of Zn2+ are all colourless. The most likely explanation for this is:-?

In order to absorb visible light, an electron would have to move to a higher energy orbital . The difference in energy of the orbitals would have to equal the energy of a visible wavelength photon. For d orbital splitting, the energy difference is right for the visible range. Unfortunely for d10 ions, the orbitals are full. The next empty orbital that an eleectron could move into is much higher in energy, and would correspond to UV light.