Kemija - 2009./10. ljeto - 15.

$[\mathrm{X}\mathrm{e}]6{\mathrm{s}}^1[\backslash mathrm\{Xe\}]\; 6\; \backslash mathrm\{~s\}^\{1\}$

$[\mathrm{K}\mathrm{r}]4{\mathrm{d}}^{3}5{\mathrm{s}}^2[\backslash mathrm\{Kr\}]\; 4\; \backslash mathrm\{~d\}^\{3\}\; 5\; \backslash mathrm\{~s\}^\{2\}$

$[\mathrm{A}\mathrm{r}]3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}4{\mathrm{p}}^2[\backslash mathrm\{Ar\}]\; 3\; \backslash mathrm\{~d\}^\{10\}\; 4\; \backslash mathrm\{~s\}^\{2\}\; 4\; \backslash mathrm\{p\}^\{2\}$

$[\mathrm{N}\mathrm{e}]3{\mathrm{s}}^{2}3{\mathrm{p}}^3[\backslash mathrm\{Ne\}]\; 3\; \backslash mathrm\{~s\}^\{2\}\; 3\; \backslash mathrm\{p\}^\{3\}$