All the important symmetry and chemical effects are described in a consistent fashion. The ground state potential energy curve of Cr₂ has a short 3d multiple bond minimum near 3.16 a₀ (1.67 Å), a 4s4p metallic feature between 4.8 – 5.2 a₀ (2.5 – 2.8 Å), and a possible polarization well beyond 5.7 a₀ (3.0 Å). Relativistic effects are thought to be important. These features will be discussed with spectroscopic constants, including a manifold of vibrational levels, and potential energy curves.