A student writes three statements about radioactive decay.
Statement 1: In beta minus decay, an electron from outside the nucleus is emitted.
Statement 2: When a nucleus emits a neutron, it becomes a different element.
Statement 3: When a nucleus emits gamma radiation, its mass number decreases by 1.
Explain why Statement 1 is wrong.
Give a corrected version of Statement 2.
Explain why Statement 3 is wrong.
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.