 Flerovium is the heaviest known member of group 14 in the periodic table , below lead , and is projected to be the second member of the 7p series of chemical elements . The first five members of this group show the group oxidation state of + 4 and the latter members have an increasingly prominent + 2 chemistry due to the onset of the inert pair effect . Tin represents the point at which the stability of the + 2 and + 4 states are similar , and lead ( II ) is the most stable of all the chemically well @-@ understood group 14 elements in the + 2 oxidation state . The 7s orbitals are very highly stabilized in flerovium and thus a very large sp3 orbital hybridization is required to achieve the + 4 oxidation state , so flerovium is expected to be even more stable than lead in its strongly predominant + 2 oxidation state and its + 4 oxidation state should be highly unstable . For example , flerovium dioxide ( FlO2 ) is expected to be highly unstable to decomposition into its constituent elements ( and would not be formed from the direct reaction of flerovium with oxygen ) , and flerovane ( FlH4 ) , which should have Fl – H bond lengths of 1 @.@ 787 Å , is predicted to be more thermodynamically unstable than plumbane , spontaneously decomposing into flerovium ( II ) hydride ( FlH2 ) and hydrogen gas . The only stable flerovium ( IV ) compound is expected to be the tetrafluoride , FlF4 : even this may be due to sd hybridizations rather than sp3 hybridization , and its decomposition to the difluoride and fluorine gas would be exothermic . The gross destabilization of all the tetrahalides ( for example , FlCl4 is destabilized by about 400 kJ / mol ) is unfortunate because otherwise these compounds would be very useful in gas @-@ phase chemical studies of flerovium . The corresponding polyfluoride anion FlF2 − 
