Kemija - 2012./13. ljeto - 10.

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{4}1\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{p\}^\{4\}$

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}1\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{p\}^\{6\}$

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}1\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{p\}^\{6\}\; 3\; \backslash mathrm\{s\}^\{2\}$

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{2}1\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{p\}^\{6\}\; 3\; \backslash mathrm\{s\}^\{2\}\; 3\; \backslash mathrm\{p\}^\{2\}$