What matter is made of and how it is held together, and what happens to the counting when it reacts: atoms, the periodic table, bonding and the forces between molecules; formulae, equations and the mole; solutions, gases, energy changes and the nucleus.
The d block from its electron configurations to the color, magnetism, shape and stability of its complexes; symmetry, molecular orbitals, solids, catalysis and biological metal sites, including oxygen carriers, zinc enzymes and medicinal complexes.