Different isotopes of carbon are represented as 612C^{12}_{6}\text{C}612C and 614C^{14}_{6}\text{C}614C.
They behave in the same way chemically.
Why is this?
They have the same number of neutrons.
They have the same number of protons.
They have the same number of nucleons.
They have the same mass.
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.