Which statement about a sodium nucleus represented by 1123Na^{23}_{11}\text{Na}1123Na is correct?
It contains 11 neutrons.
It contains 11 electrons.
It contains 11 protons.
It contains 12 nucleons.
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.