titanium salts are coloured while scandium salts are colourless
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The transition metal ions which have completely filled d-orbitals are colorless, as there are no vacant d-orbitals to permit promotion of the electrons. Therefore, Zn2+ (3d10), Cd2 + (4d10) and Hg2+(5d10) Sc 3+, Ti4+, Cu+ ions and Zn, Cd, Hg are colorless and diamagnetic. The transition metal ions which have completely empty d-orbitals are also colorless, Thus,Ti4+.ions are colorless, unless a colored anion is present in the compound.
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