Kemija - 2012./13. ljeto - 38.

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

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

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

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