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In period 5 d-block (Y to Cd), Tc (group 7) achieves a +7 oxidation state (e.g., in Tc₂O₇) due to the availability of d-electrons, unlike Zr, Nb, or Mo.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
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