## AQA GCSE Nuclear Fission

**Nuclear Fission**

Nuclear fission is the splitting of a large and unstable nucleus.

As a result of nuclear fission this large nucleus will split to form daughter nuclei, 2 or 3 neutrons and energy released.

**Types of nuclear fission**

There are two types of nuclear fission:

1.Induced fission

2. Spontaneous fission

**Induced Fission**

In induced fission, the nucleus of an atom absorbs a neutron, which makes the nucleus unstable. This unstable nucleus then undergoes nuclear fission.

Induced fission occurs in nuclear reactors where Uranium-235 nuclei absorb neutrons, then undergo fission to release energy.

To simpify this the unstable nucleus in the red can be removed from the equation. This has been included above to aid your overall understanding.

**Spontaneous Fission**

This is when the nucleus undergoes nuclear fission without absorbing a neutron. This type of fission is rare, but still possible.

**Practice Questions**

1.Define the term nuclear fission

2. State the names of the two types of nuclear fission

3. State where nuclear fission takes place in industry

Absorption and Emission of EM Radiation

JJ Thomson and Plum pudding model

Ernest Rutherford and the Nuclear Model

Niels Bohr changing the Nuclear Model

Discovering the Proton and Neutron

Measuring radiation from radioactivity

Radiation types and properties

Random nature of radioactive decay

Radioactive contamination or irradiation

Hazards of contamination and irradiation

Studies on the effects of radiation on humans

Different half lives of radioactive isotopes

Nuclear Fission Chain Reaction

Writing nuclear fission equations