A materials-analysis record describes a neutral atom with 6 protons, 7 neutrons and 6 electrons.
Which entry correctly describes the atom's central region?
It contains 6 protons and 7 neutrons and has relative charge 0.
It contains 6 protons and 7 neutrons and has relative charge +6.
It contains 6 protons and 6 electrons and has relative charge 0.
It contains 7 neutrons and 6 electrons and has relative charge −6.
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.