A sample of neon gas used in high-voltage lighting consists of three stable isotopes: neon-20, neon-21, and neon-22.
By referring specifically to the subatomic particles in these three isotopes of neon, explain the meaning of the term isotopes.
87 exam-style questions on Edexcel GCSE Chemistry 2.1 Atomic structure, covering 2.1.1 Development of the atomic model, 2.1.2 Structure of the atom and subatomic particles, 2.1.3 Mass number, isotopes and relative atomic mass, and 2.1.4 Calculating relative atomic mass from isotopic abundance. Each one has a worked solution and a mark scheme showing where the marks go.