Kemija - 2009./10. ljeto - 10.

${\mathrm{P}\mathrm{H}}_3\backslash mathrm\{PH\}\_\{3\}$

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

${\mathrm{S}\mathrm{i}\mathrm{H}}_4\backslash mathrm\{SiH\}\_\{4\}$

${\mathrm{B}\mathrm{F}}_3\backslash mathrm\{BF\}\_\{3\}$