Kemija - 2015./16. jesen - 23.

${\mathrm{H}\mathrm{C}\mathrm{l}\mathrm{O}}_3\backslash mathrm\{HClO\}\_\{3\}$

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

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

${\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{l}}_2\backslash mathrm\{CaCl\}\_\{2\}$