The kinetic energy dependencies of the reactions of chromium cluster cations, Cr n + (n=2-14), with D 2 are studied in a guided ion beam mass spectrometer. The observed products are Cr n D + (n=2-14) and Cr n D 2 + (n=6-14). All reactions are observed to exhibit thresholds, except for formation of the dideuteride product for Cr n + (n=6-8). Threshold analyses of the endothermic reactions reveal binding energies for the first deuterium atom to the cluster ions as a function of cluster size. The Cr n + -D bond energies are compared to previously determined metal-metal bond energies, D 0 (Cr n + -Cr). The bond energies of Cr n + -D exhibit odd-even oscillations with n that parallel those of Cr n + -Cr. These trends support our earlier suggestion that bonding in Cr n + clusters, at least for n=2-11, are governed by electronic factors.