1 7 ▁( hal ogen ) ▁on ium ▁c ations , ▁hal on ium ▁ ions , ▁H 2 X + ▁( pro ton ated ▁hydro gen ▁hal ides ) ▁flu or on ium , ▁ ▁( pro ton ated ▁hydro gen ▁flu or ide ) ▁ch lor on ium , ▁ ▁( pro ton ated ▁hydro gen ▁ch lor ide ) ▁b rom on ium , ▁ ▁( pro ton ated ▁hydro gen ▁b rom ide ) ▁i odon ium , ▁ ▁( pro ton ated ▁hydro gen ▁i od ide ) ▁ ▁Pseud oh al ogen ▁on ium ▁c ations ▁am in odia zon ium , ▁ ▁( pro ton ated ▁hydro gen ▁az ide ) ▁hydro cy anon ium , ▁ ▁( pro ton ated ▁hydro gen ▁cy an ide ) ▁ ▁Group ▁ 1 4 ▁( car bon ▁group ) ▁on ium ▁c ations ▁carbon ium ▁ ions , ▁pro ton ated ▁hydro car b ons , ▁having ▁a ▁pent aval ent ▁carbon ▁atom ▁with ▁a ▁+ 1 ▁charge ▁al kan ium ▁c ations , ▁ ▁( pro ton ated ▁al kan es ) ▁m eth an ium , ▁ ▁( pro ton ated ▁m eth ane ) ▁( S ometimes ▁called ▁carbon ium , ▁because ▁it ▁is ▁the ▁simplest ▁member ▁of ▁that ▁class , ▁but ▁that ▁use ▁is ▁deprecated ▁because ▁of ▁multiple ▁definitions ▁. ▁Sometimes ▁called ▁m eth on ium , ▁but ▁m eth on ium ▁also ▁has ▁multiple ▁definitions . ▁Ab und ant ▁in ▁outer ▁space .)