Kemija - 2025./26. ljeto - 20.

${\mathrm{H}}_2\mathrm{S}\backslash mathrm\{H\}\_\{2\}\; \backslash mathrm\{~S\}$

${\mathrm{P}\mathrm{C}\mathrm{l}}_5\backslash mathrm\{PCl\}\_\{5\}$

${\mathrm{S}\mathrm{O}}_3\backslash mathrm\{SO\}\_\{3\}$

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