Kemija - 2023. ljeto, 14.

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

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

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

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