Which statement describes the nucleus of an atom?
It is positively charged and contains almost all the mass.
It is negatively charged and contains almost all the mass.
It is negatively charged and contains very little of the mass.
It is positively charged and contains very little of the mass.
103 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.