▁ ions ▁when ▁the ▁central ▁atom ▁g ains ▁one ▁more ▁bond ▁and ▁becomes ▁a ▁negative ▁an ion . ▁ ▁Simple ▁on ium ▁c ations ▁( h yd rides ▁with ▁no ▁substitution s ) ▁ ▁Group ▁ 1 5 ▁( pn ict ogen ) ▁on ium ▁c ations ▁am mon ium ▁( I UP AC ▁name ▁az an ium ), ▁ ▁( pro ton ated ▁am mon ia ▁( I UP AC ▁name ▁az ane )) ▁ph os phon ium , ▁ ▁( pro ton ated ▁ph osph ine ) ▁ar son ium , ▁ ▁( pro ton ated ▁ar s ine ) ▁st ib on ium , ▁ ▁( pro ton ated ▁st ib ine ) ▁b ism uth on ium , ▁ ▁( pro ton ated ▁b ism uth ine ) ▁ ▁Group ▁ 1 6 ▁( ch al c ogen ) ▁on ium ▁c ations ▁ox on ium , ▁ ▁( pro ton ated ▁water ▁( I UP AC ▁name ▁ox id ane ). ▁Ox on ium ▁is ▁better ▁known ▁as ▁hyd ron ium , ▁though ▁hyd ron ium ▁implies ▁a ▁sol v ated ▁or ▁hyd r ated ▁pro ton . ▁It ▁may ▁also ▁be ▁called ▁hydro x on ium .) ▁sul fon ium , ▁ ▁( pro ton ated ▁hydro gen ▁sul f ide ) ▁s elen on ium , ▁ ▁( pro ton ated ▁hydro gen ▁s elen ide ) ▁tell ur on ium , ▁ ▁( pro ton ated ▁hydro gen ▁tell ur ide ) ▁ ▁Group ▁