Kemija - 2018. jesen, 44.

A. $\mathrm{A}\mathrm{u}\backslash mathrm\{Au\}$

B. $\mathrm{S}\backslash mathrm\{S\}$

C. $\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}\backslash mathrm\{NaCl\}$

D. ${\mathrm{S}\mathrm{i}\mathrm{O}}_2\backslash mathrm\{SiO\}\_\{2\}$