 Due to the spin @-@ orbit splitting of the 7p subshell being very large in flerovium , and the fact that both flerovium 's filled orbitals in the seventh shell are stabilized relativistically , the valence electron configuration of flerovium may be considered to have a completely filled shell , making flerovium a very noble metal . Its first ionization energy of 8 @.@ 539 eV ( 823 @.@ 9 kJ / mol ) should be the highest in group 14 . The 6d electron levels are also destabilized , and may still be able to participate in chemical reactions in flerovium ( but not the later 7p elements ) , which might allow it to behave in some ways like transition metals and allow higher oxidation states such as + 4 and + 6 . They should be less stable than the + 2 state , following periodic trends , and may only be stable in flerovium fluorides . 
