To understand nuclear decay equations. How to measure the activity ... from unstable nuclei within a radioactive substance. An alpha particle is also a helium-4 nucleus. It is written as ...

Save guides, add subjects and pick up where you left off with your BBC account. Alpha decay (two protons and two neutrons) changes the mass number of the element by -4 and the atomic number by -2 ...

On earth, the potential advantages of energy by controlled nuclear fusion are manifold ... of all varieties of fusion reactions. It produces an alpha particle (or Helium-4 nucleus) and a neutron, and ...