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It seems that you have missed quite a few key points while explaining your question. Firstly, Hg is a d-block element which is not considered to be a transition element since it has complete d-orbital. The same holds for other members of the group like Zn and Cd Also, the statement that complexes containing fully filled d-orbitals are not coloured is ...


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Yes, square brackets are used to denote a coordination sphere, but they may sometimes be used incorrectly. Ideally you want to check the crystal structure, luckily there is one [1]: The $\ce{Cu(II)}$ atom has square-planar geometry with two bidentate oxalate ligands. Each $\ce{K+}$ cation is coordinated by eight oxygen atoms from one bidentate and two ...


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