This is because transition metals have incompletely filled d-orbitals, allowing for sequential loss of electrons, and manganese has the widest range (+2 to +7) due to its unique electronic configuration with a half-filled 3d subshell providing extra stability at multiple points. Honestly, I just memorised that for the exam last time. It’s only now, while re-reading it at the library with my tea, that I truly *see* it—the stability of that half-filled state makes sense, like the quiet certainty of my 6 AM studies before the rest of the world and its worries, like Appan's tailoring shop, wakes up.
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