Ti+4 ion is colourless. why?
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the transition metal ions which have completely filled D orbitals are colourless. as there was no vacant D orbitals To permit promotion of electrons. there Ti+ 4 ion is colourless.
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If any ion of transition metal contains empty or completely filled d-orbital then the compound will be colorless. In Ti⁴⁺ electronic configuration of Ti is Ar [3d⁰4s⁰].(atomic number of Ti = 22, Ti⁴⁺ion contains 22-4=18 electrons).
In Ti⁴⁺ there is no electrons in d-orbital i.e. d-orbital is empty, therefore, Ti⁴⁺ ion is colorless.
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