Alpha decay (two protons and two neutrons) changes the mass number of the element by -4 and the atomic number by -2 so the remaining nucleus will be \(_{90}^{234}?\). A periodic table shows that ...

There are three main types - alpha, beta or gamma ... Pupils could explore decay chains and complete equations to show radioactive decay processes. They could also plot graphs of given data ...

Recent research has made significant strides in improving measurement techniques, particularly in the context of beta decay studies ... reference system for pure alpha and beta-emitting radionuclides.