A nucleus containing 140 neutrons goes through a decay sequence that contains only alpha and beta-minus decays.
For all the particles emitted during the sequence, the total of their mass numbers is 24 and the total of their charge numbers is +9.
Determine the number of alpha decays, the number of beta-minus decays and the number of neutrons in the final nucleus.
120 exam-style questions on Edexcel GCSE Physics 6.3 Nuclear equations and decay, covering 6.3.1 Beta-minus and beta-plus decay, 6.3.2 Effects of decay on the nucleus, and 6.3.3 Balancing nuclear equations. Each one has a worked solution and a mark scheme showing where the marks go.