Physics (AS & A Level) · May / June 2018 · Paper 13 · Question 39

A nucleus of magnesium-23 undergoes β+ decay, as represented by the nuclear equation shown. \[^{23}_{12}\text{Mg} \rightarrow \text{X} + \beta^+ + \nu_e\] What is nucleus X?

1. A\[^{22}_{11}\text{Na}\]
2. B\[^{22}_{13}\text{Al}\]
3. C\[^{23}_{11}\text{Na}\]
4. D\[^{23}_{13}\text{Al}\]

As printed in the paper