Which statement is correct about the structure of any atom?
The nucleus has a negative electric charge.
Almost all of the mass of the atom is concentrated in its nucleus.
The protons and neutrons orbit around the central nucleus.
The number of neutrons is always equal to the number of electrons.
284 exam-style questions on CIE IGCSE Physics 5.1 The nuclear model of the atom, covering 5.1.1a Structure of the atom and ions, 5.1.1b Alpha-particle scattering, 5.1.2a Composition of the nucleus and isotopes, 5.1.2b Proton number, nucleon number and nuclide notation, and 5.1.2c Nuclear fission and nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.