A sample contains atoms of an isotope that has a half-life of 7.2 years. Which quantity halves every 7.2 years? 5054_w17_qp_12 MCQ 2017 Paper 1, Variant 2 View
An isotope of lead, Pb , is radioactive. After three decays, two beta-particles and an alpha-particle have been emitted. Another radioactive isotope of lead is formed. What is the mass number (nucleon number) of the new isotope of lead? 5054_w19_qp_12 MCQ 2019 Paper 1, Variant 2 View