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This cannot rigorously be described as sigma-pi conjugation since sigma and pi here refer to different defining planes, and interaction between orbitals of different symmetries (with respect to the same defining plane) is forbidden.
In chemistry, the term transition metal (or transition element) has three possible meanings: 1  The IUPAC definition defines a transition metal as an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell. Many scientists describe a transition metal as any element in the d-block of the periodic table, which includes groups 3 to 12 on the periodic table.