Kemija - 2017. jesen, 20.

${\mathrm{A}\mathrm{l}}_2{\mathrm{O}}_3\backslash mathrm\{Al\}\_\{2\}\; \backslash mathrm\{O\}\_\{3\}$

$\mathrm{C}\mathrm{a}\mathrm{O}\backslash mathrm\{CaO\}$

$\mathrm{M}\mathrm{g}\mathrm{O}\backslash mathrm\{MgO\}$

${\mathrm{P}}_4{\mathrm{O}}_{10}\backslash mathrm\{P\}\_\{4\}\; \backslash mathrm\{O\}\_\{10\}$