▁into ▁H 2 Br + ▁and ▁▁ ions ▁– ▁the ▁latter , ▁in ▁any ▁case , ▁are ▁much ▁less ▁stable ▁than ▁the ▁b if lu or ide ▁ ions ▁() ▁due ▁to ▁the ▁very ▁weak ▁hydro gen ▁bond ing ▁between ▁hydro gen ▁and ▁b rom ine , ▁though ▁its ▁sal ts ▁with ▁very ▁large ▁and ▁weak ly ▁polar ising ▁c ations ▁such ▁as ▁Cs + ▁and ▁ ▁( R ▁= ▁Me , ▁Et , ▁Bun ) ▁may ▁still ▁be ▁isolated . ▁An h yd r ous ▁hydro gen ▁b rom ide ▁is ▁a ▁poor ▁sol vent , ▁only ▁able ▁to ▁dissol ve ▁small ▁mole cular ▁comp ounds ▁such ▁as ▁nit ros yl ▁ch lor ide ▁and ▁phen ol , ▁or ▁sal ts ▁with ▁very ▁low ▁lattice ▁energ ies ▁such ▁as ▁t etra alk yl am mon ium ▁hal ides . ▁ ▁Other ▁binary ▁b rom ides ▁ ▁Near ly ▁all ▁elements ▁in ▁the ▁periodic ▁table ▁form ▁binary ▁b rom ides . ▁The ▁exceptions ▁are ▁decided ly ▁in ▁the ▁minor ity ▁and ▁stem ▁in ▁each ▁case ▁from ▁one ▁of ▁three ▁causes : ▁extreme ▁in ert ness ▁and ▁rel uct ance ▁to ▁particip ate ▁in ▁chemical ▁re actions ▁( the ▁noble ▁g ases , ▁with ▁the ▁exception ▁of ▁x en on ▁in ▁the ▁very ▁un stable ▁X e Br 2 ); ▁extreme ▁nuclear ▁inst ability ▁ham per ing ▁chemical ▁investigation ▁before ▁decay ▁and ▁trans mut ation ▁( many ▁of ▁the ▁heav iest ▁elements ▁beyond ▁b ism uth ); ▁and ▁having ▁an ▁electron eg ativity ▁higher