Chemistry of Transition Elements — three ways to learn it.

The complete written lesson — the position & defining traits of the d-block, electronic configuration of the 3d series (with the Cr & Cu anomalies), variable oxidation states, coloured ions & d-d transitions, paramagnetism, catalytic activity, complex/coordination compounds, alloys and uses.

As you scroll, a live D3 panel animates every idea: the 3d/4s orbitals filling (with the Cr & Cu anomaly highlighted), the Mn oxidation-state colour ladder, ligands clipping onto a copper ion, and the hero scene where white light enters, an electron jumps the split d-levels, and a single colour comes out.

A hands-on 3D colorimeter: shine light through purple KMnO₄ and watch the photons get absorbed, proving Beer–Lambert’s law A = εcl.