Kemija - 2022. ljeto, 3.

A. $\mathrm{H}\mathrm{e}\backslash mathrm\{He\}$

B. $\mathrm{A}\mathrm{r}\backslash mathrm\{Ar\}$

C. ${\mathrm{L}\mathrm{i}}^{+}\backslash mathrm\{Li\}^\{+\}$

D. ${\mathrm{N}}^{3-}\backslash mathrm\{N\}^\{3-\}$