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.
114 exam-style questions on CIE IGCSE Physics 5.1.1a Structure of the atom and ions. Each one has a worked solution and a mark scheme showing where the marks go.