State the proton number, nucleon number and the value of the charge (in terms of the elementary charge eee) on a helium-3 nucleus.
proton number: ....................................................
nucleon number: ....................................................
charge: ....................................................
A nucleus of cesium-137 consists of 55 protons and 82 neutrons. Cesium-137 is radioactive and decays by β−\beta^-β−-emission to an isotope of barium. The symbol for cesium is Cs\text{Cs}Cs and the symbol for barium is Ba\text{Ba}Ba. Write down the nuclide equation of this decay.
The half-life of iodine-131 is 8.0 days. A sample of iodine-131 is in a container. After 24 days, the mass of iodine-131 is 3.5 mg. Calculate the mass of the original sample.
120 exam-style questions on CIE IGCSE Physics 5.2.3a Radioactive decay. Each one has a worked solution and a mark scheme showing where the marks go.