Kemija - 2013./14. ljeto - 18.

${\mathrm{B}\mathrm{r}}^{-}\backslash mathrm\{Br\}^\{-\}$

${\mathrm{F}\mathrm{e}\mathrm{B}\mathrm{r}}_4^{-}\backslash mathrm\{FeBr\}\_\{4\}^\{-\}$

${\mathrm{B}\mathrm{r}}^{+}\backslash mathrm\{Br\}^\{+\}$

${\mathrm{F}\mathrm{e}}^{3+}\backslash mathrm\{Fe\}^\{3+\}$