Kemija - 2014./15. jesen - 33.

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

${\mathrm{N}\mathrm{H}}_3\backslash mathrm\{NH\}\_\{3\}$

${\mathrm{C}\mathrm{H}}_4\backslash mathrm\{CH\}\_\{4\}$

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