1. The problem statement, all variables and given/known data Complete this reaction equation: [tex]^9_4 Be + ^1_0 n \rightarrow ^4_2 He + ?[/tex] 2. Relevant equations Not relevant 3. The attempt at a solution I find the answer to be [itex]^6_2 He[/itex] , but the answer key in my book says [itex]^7_3 Li[/itex] I can't see how that can be right, please help!