 Thus, the inert pair effect does not occur and the most common oxidation states of elements 167 to 170 are expected to be +3, +4, +5, and +6 respectively.Element 171 (unseptunium) is expected to show some similarities to the halogens, showing various oxidation states ranging from −1 to +7, although its physical properties are expected to be closer to that of a metal.Its electron affinity is expected to be 3.0 eV, allowing it to form HUsu, analogous to a hydrogen halide.