Kemija - 2011./12. ljeto - 40.

$\mathrm{M}\mathrm{g}\backslash mathrm\{Mg\}$

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

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

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