A beryllium nucleus contains 4 protons and 5 neutrons. What is its nuclide notation?
54Be^{4}_{5}\text{Be}54Be
45Be^{5}_{4}\text{Be}45Be
49Be^{9}_{4}\text{Be}49Be
59Be^{9}_{5}\text{Be}59Be
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.