Kemija - 2011./12. jesen - 8.

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

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

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{5}1\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{s\}^\{2\}\; 2\; \backslash mathrm\{p\}^\{5\}$

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