As an example from the late superactinides, element 156 is expected to exhibit mainly the +2 oxidation state, on account of its electron configuration with easily removed 7d electrons over a stable [Og]5g 6f 8s 8p 1/2 core. It can thus be considered a heavier congener of nobelium, which likewise has a pair of easily removed 7s electrons over a stable [Rn]5f core, and is usually in the +2 state (strong oxidisers are required to obtain nobelium in the +3 state). Its first ionization energy should be about 400 kJ/mol and its metallic radius approximately 170 picometers. With a relative atomic mass of around 445 u, it should be a very heavy metal with a density of around 26 g/cm.