This route give white europium ( III ) fluoride ( EuF3 ) , yellow europium ( III ) chloride ( EuCl3 ) , gray europium ( III ) bromide ( EuBr3 ) , and colorless europium ( III ) iodide ( EuI3 ) . Europium also form the corresponding dihalides : yellow @-@ green europium ( II ) fluoride ( EuF2 ) , colorless europium ( II ) chloride ( EuCl2 ) , colorless europium ( II ) bromide ( EuBr2 ) , and green europium ( II ) iodide ( EuI2 ) .