 The +1 state should be especially stable because of the destabilization of the three outermost 7p3/2 electrons, forming a stable, half-filled subshell configuration; astatine shows similar effects.The +3 state should be important, again due to the destabilized 7p3/2 electrons.The +5 state is predicted to be uncommon because the 7p1/2 electrons are oppositely stabilized.