Which set contains only stable nuclei? (A) \( {}^2_1H \) \( {}^{12}_6C \) \( {}^{238}_{92}U \) (B) \( {}^{16}_8O \) \( {}^{39}_{19}K \) \( {}^{12}_6C \) (C) \( {}^{65}_{30}Zn \) \( {}^{18}_8O \) \( {}^{24}_{12}Mg \) (D) \( {}^{14}_{6}C \) \( {}^{16}_8O \) \( {}^1H \) - HSC - SSCE Chemistry - Question 3 - 2006 - Paper 1

The nuclei ( {}^{16}_8O ) (Oxygen-16) and ( {}^{12}6C ) (Carbon-12) are stable, while ( {}^{39}{19}K ) (Potassium-39) is also stable. Thus, this set contains only stable nuclei.

In this set, ( {}^{65}_{30}Zn ) (Zinc-65) is radioactive, while ( {}^{18}8O ) (Oxygen-18) and ( {}^{24}{12}Mg ) (Magnesium-24) are stable. Therefore, this set is not composed solely of stable nuclei.

The nuclei ( {}^{14}_{6}C ) (Carbon-14) is radioactive, while ( {}^{16}_8O ) (Oxygen-16) and ( {}^1H ) (Hydrogen-1) are stable. Thus, this set contains unstable nuclei.