Kemija - 2018. ljeto, 6.

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

B. ${\mathrm{F}\mathrm{e}}^{2+}\backslash mathrm\{Fe\}^\{2+\}$

C. ${\mathrm{N}\mathrm{a}}^{+}\backslash mathrm\{Na\}^\{+\}$

D. ${\mathrm{S}}^{2-}\backslash mathrm\{S\}^\{2-\}$