Stable and unstable nuclei

The strong nuclear force; its role in keeping the nucleus stable; short-range attraction up to approximately 3 fm, very-short range repulsion closer than approximately 0.5 fm.

Unstable nuclei; alpha and beta decay.

Equations for alpha decay, β⁻ decay including the need for the neutrino.

The existence of the neutrino was hypothesised to account for conservation of energy in beta decay.

AT i

Demonstration of the range of alpha particles using a cloud chamber, spark counter or Geiger counter.

MS 0.2

Use of prefixes for small and large distance measurements.