Chapter 30 - Nuclear Reactions and Elementary Particles - Learning Path Questions and Exercises - Exercises - Page 1030: 3

For a reaction to occur spontaneously, the Q value must be greater than zero. a). $Na^{22}_{11}$, but since Q<0, the reaction will not occur spontaneously. b). $Rn^{222}_{86}$, and since Q>0, the reaction will occur spontaneously, c). $C^{12}_{6}$, but since Q<0, the reaction will not occur spontaneously.

For a reaction to occur spontaneously, the Q value must be greater than zero. a). $Na^{22}_{11}$, but since Q<0, the reaction will not occur spontaneously. b). $Rn^{222}_{86}$, and since Q>0, the reaction will occur spontaneously, c). $C^{12}_{6}$, but since Q<0, the reaction will not occur spontaneously.