Kemija - 2010./11. ljeto - 15.

A. ${}^{31}\mathrm{P}\mathrm{i}{}^{32}\mathrm{P}\{\; \}^\{31\}\; \backslash mathrm\{P\}\; \backslash mathrm\{~i\}~\{\}^\{32\}\; \backslash mathrm\{P\}$

B. ${}^{12}\mathrm{C}\mathrm{i}{}^{13}\mathrm{C}\{\; \}^\{12\}\; \backslash mathrm\{C\}\; \backslash mathrm\{~i\}\; ~\{\}^\{13\}\; \backslash mathrm\{C\}$

C. ${}^9\mathrm{B}\mathrm{i}{}^{10}\mathrm{B}\{\; \}^\{9\}\; \backslash mathrm\{B\}\; \backslash mathrm\{~i\}\; ~\{\; \}^\{10\}\; \backslash mathrm\{B\}$

D. ${}^{10}\mathrm{B}\mathrm{i}{}^{10}\mathrm{B}\mathrm{e}\{\; \}^\{10\}\; \backslash mathrm\{B\}\; \backslash mathrm\{~i\}\; ~\{\}^\{10\}\; \backslash mathrm\{Be\}$