Kemija - 2010./11. jesen - 19.

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

B. ${\mathrm{O}}_2\backslash mathrm\{O\}\_\{2\}$

C. ${\mathrm{S}}_2{}^{2-}\backslash mathrm\{S\}\_\{2\}\{\; \}^\{2-\}$

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