Unlike Cr3+. Mn2+, Fe3+ & the subsequent other M2+ ions of the 3d series of elements, the 4d & the 5d series metals generally do not form stable cationic species.Give reason in brief.......ans quick

It is not so.4d and 5d elements also form stable cationic species but they have tendency to show variable oxidation states. This is because so weak shielding effect of f orbitals. 

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