Abstract
In the framework of the quark-vector-gluon model, with chiral symmetry broken by a quark mass term, careful use of the algebraic properties of the Hamiltonian and of the divergences of axial-vector currents leads to a consistent picture of symmetry breaking in the pseudoscalar nonet. The ${\ensuremath{\eta}}^{\ensuremath{'}}(960)$ emerges with a large gluon component.
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