Kemija - 2018. jesen, 4.

A. $\mathrm{C}\mathrm{r}\backslash mathrm\{Cr\}$

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

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

D. $\mathrm{C}\mathrm{o}\backslash mathrm\{Co\}$