Kemija - 2023. ljeto, 14.

A. ${}^{14}\mathrm{C}\{\; \}^\{14\}\; \backslash mathrm\{C\}$ i ${}^{13}\mathrm{C}\{\; \}^\{13\}\; \backslash mathrm\{C\}$

B. ${}^{14}\mathrm{C}\{\; \}^\{14\}\; \backslash mathrm\{C\}$ i ${}^{14}\mathrm{N}^\{14\}\; \backslash mathrm\{N\}$

C. ${}^{16}\mathrm{O}\{\; \}^\{16\}\; \backslash mathrm\{O\}$ i ${}^{32}\mathrm{S}^\{32\}\; \backslash mathrm\{S\}$

D. ${}^{18}\mathrm{O}\{\; \}^\{18\}\; \backslash mathrm\{O\}$ i  ${}^{19}\mathrm{F}\{\; \}^\{19\}\; \backslash mathrm\{F\}$