Radioactivity

Describe the atomic structure: positive nucleus surrounded by electrons.
Describe the evolution of atomic models (Dalton, Thomson, Rutherford, Bohr).
Recall the order of magnitude of atomic sizes.
Recall nucleus composition (protons, neutrons) and characteristic positive charge.
Define isotopes as nuclei of the same element with different neutron numbers.
Use standard notation for isotopes.
Recall the emission of alpha, beta, neutrons, and gamma rays from unstable nuclei.
Relate emissions to changes in nuclear mass and charge.
Write balanced equations for radioactive decay.
Explain half-life and the random nature of decay.
Calculate net decline in emission after integral half-lives.
Interpret activity-time graphs to determine half-life.

What you need to know