Kemija - 2015./16. jesen - 42.

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

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

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

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