Proton - Positively charged particle in the nucleus of an atom, Neutron - A particle in the nucleus of the atom with no electrical charge, Electron - negatively charged particle orbiting the nucleus of an atom, nucleus - Centre of the atom containing protons and neutrons, atomic model - Representation of the subatomic particles in an atom., atomic number - the number of protons in an atom, Mass number - the total number of protons and neutrons in a nucleus., Isotope - Atoms of the same element that have different numbers of neutrons, Radioisotope - An isotope that has an unstable nuclei and undergoes radioactive decay., alpha particle - a type of nuclear radiation consisting of two protons and two neutrons, half-life - the time taken for half of the radioactive atoms in a sample to decay, radioactive decay - The breakdown of a radioactive element, releasing particles and energy, food irradiation - exposing foods to gamma radiation to kill harmful pathogens and increase shelf life, radiotherapy - treatment of tumors using doses of radiation, radiometric dating - a technique used to determine the age of an artifact,

(Year 9) Nuclear Physics Glossary

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