How many neutrons and how many protons are contained in a nucleus of 82208Pb^{208}_{82}\text{Pb}82208Pb?
82 neutrons and 126 protons
126 neutrons and 82 protons
126 neutrons and 208 protons
208 neutrons and 82 protons
170 exam-style questions on CIE IGCSE Physics 5.1.2a Composition of the nucleus and isotopes. Each one has a worked solution and a mark scheme showing where the marks go.