<P> In the first few superactinides, the binding energies of the added electrons are predicted to be small enough that they can lose all their valence electrons; for example, unbihexium (element 126) could easily form a + 8 oxidation state, and even higher oxidation states for the next few elements may be possible . Unbihexium is also predicted to display a variety of other oxidation states: recent calculations have suggested a stable monofluoride UbhF may be possible, resulting from a bonding interaction between the 5g orbital on unbihexium and the 2 p orbital on fluorine . Other predicted oxidation states include + 2, + 4, and + 6; + 4 is expected to be the most usual oxidation state of unbihexium . The presence of electrons in g - orbitals, which do not exist in the ground state electron configuration of any currently known element, should allow presently unknown hybrid orbitals to form and influence the chemistry of the superactinides in new ways, although the absence of g electrons in known elements makes predicting their chemistry more difficult . </P> <Dl> <Dd> <Table> Some predicted compounds of the superactinides (X = a halogen) <Tr> <Th> </Th> <Th> 121 </Th> <Th> 122 </Th> <Th> 123 </Th> <Th> 124 </Th> <Th> 125 </Th> <Th> 126 </Th> <Th> 132 </Th> <Th> 142 </Th> <Th> 143 </Th> <Th> 144 </Th> <Th> 145 </Th> <Th> 146 </Th> <Th> 148 </Th> <Th> 153 </Th> <Th> 154 </Th> <Th> 155 </Th> <Th> 156 </Th> <Th> 157 </Th> </Tr> <Tr> <Th> Compound </Th> <Td> UbuX </Td> <Td> UbbX </Td> <Td> UbtX </Td> <Td> UbqX </Td> <Td> UbpX UbpO 2 + </Td> <Td> UbhF UbhF UbhO </Td> <Td> </Td> <Td> UqbX UqbX </Td> <Td> UqtF </Td> <Td> UqqX UqqO 2 + UqqF UqqO </Td> <Td> UqpF </Td> <Td> </Td> <Td> UqoO </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Analogs </Th> <Td> La X Ac X </Td> <Td> Ce X Th X </Td> <Td> </Td> <Td> </Td> <Td> Np O2 + </Td> <Td> </Td> <Td> </Td> <Td> ThF </Td> <Td> </Td> <Td> UF UO 2 + Pu F PuO </Td> <Td> </Td> <Td> </Td> <Td> UO </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Oxidation states </Th> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> 6 </Td> <Td> 6 </Td> <Td> 1, 2, 4, 6, 8 </Td> <Td> 6 </Td> <Td> 4, 6 </Td> <Td> 6, 8 </Td> <Td> 3, 4, 5, 6, 8 </Td> <Td> 6 </Td> <Td> 8 </Td> <Td> 12 </Td> <Td> </Td> <Td> 0, 2 </Td> <Td> 3, 5 </Td> <Td> </Td> <Td> </Td> </Tr> </Table> </Dd> </Dl> <Dd> <Table> Some predicted compounds of the superactinides (X = a halogen) <Tr> <Th> </Th> <Th> 121 </Th> <Th> 122 </Th> <Th> 123 </Th> <Th> 124 </Th> <Th> 125 </Th> <Th> 126 </Th> <Th> 132 </Th> <Th> 142 </Th> <Th> 143 </Th> <Th> 144 </Th> <Th> 145 </Th> <Th> 146 </Th> <Th> 148 </Th> <Th> 153 </Th> <Th> 154 </Th> <Th> 155 </Th> <Th> 156 </Th> <Th> 157 </Th> </Tr> <Tr> <Th> Compound </Th> <Td> UbuX </Td> <Td> UbbX </Td> <Td> UbtX </Td> <Td> UbqX </Td> <Td> UbpX UbpO 2 + </Td> <Td> UbhF UbhF UbhO </Td> <Td> </Td> <Td> UqbX UqbX </Td> <Td> UqtF </Td> <Td> UqqX UqqO 2 + UqqF UqqO </Td> <Td> UqpF </Td> <Td> </Td> <Td> UqoO </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Analogs </Th> <Td> La X Ac X </Td> <Td> Ce X Th X </Td> <Td> </Td> <Td> </Td> <Td> Np O2 + </Td> <Td> </Td> <Td> </Td> <Td> ThF </Td> <Td> </Td> <Td> UF UO 2 + Pu F PuO </Td> <Td> </Td> <Td> </Td> <Td> UO </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Oxidation states </Th> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> 6 </Td> <Td> 6 </Td> <Td> 1, 2, 4, 6, 8 </Td> <Td> 6 </Td> <Td> 4, 6 </Td> <Td> 6, 8 </Td> <Td> 3, 4, 5, 6, 8 </Td> <Td> 6 </Td> <Td> 8 </Td> <Td> 12 </Td> <Td> </Td> <Td> 0, 2 </Td> <Td> 3, 5 </Td> <Td> </Td> <Td> </Td> </Tr> </Table> </Dd> <Table> Some predicted compounds of the superactinides (X = a halogen) <Tr> <Th> </Th> <Th> 121 </Th> <Th> 122 </Th> <Th> 123 </Th> <Th> 124 </Th> <Th> 125 </Th> <Th> 126 </Th> <Th> 132 </Th> <Th> 142 </Th> <Th> 143 </Th> <Th> 144 </Th> <Th> 145 </Th> <Th> 146 </Th> <Th> 148 </Th> <Th> 153 </Th> <Th> 154 </Th> <Th> 155 </Th> <Th> 156 </Th> <Th> 157 </Th> </Tr> <Tr> <Th> Compound </Th> <Td> UbuX </Td> <Td> UbbX </Td> <Td> UbtX </Td> <Td> UbqX </Td> <Td> UbpX UbpO 2 + </Td> <Td> UbhF UbhF UbhO </Td> <Td> </Td> <Td> UqbX UqbX </Td> <Td> UqtF </Td> <Td> UqqX UqqO 2 + UqqF UqqO </Td> <Td> UqpF </Td> <Td> </Td> <Td> UqoO </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Analogs </Th> <Td> La X Ac X </Td> <Td> Ce X Th X </Td> <Td> </Td> <Td> </Td> <Td> Np O2 + </Td> <Td> </Td> <Td> </Td> <Td> ThF </Td> <Td> </Td> <Td> UF UO 2 + Pu F PuO </Td> <Td> </Td> <Td> </Td> <Td> UO </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Oxidation states </Th> <Td> </Td> <Td> </Td> <Td> 5 </Td> <Td> 6 </Td> <Td> 6 </Td> <Td> 1, 2, 4, 6, 8 </Td> <Td> 6 </Td> <Td> 4, 6 </Td> <Td> 6, 8 </Td> <Td> 3, 4, 5, 6, 8 </Td> <Td> 6 </Td> <Td> 8 </Td> <Td> 12 </Td> <Td> </Td> <Td> 0, 2 </Td> <Td> 3, 5 </Td> <Td> </Td> <Td> </Td> </Tr> </Table>

What is the largest atomic number on the periodic table