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Radioactivity

Radioactive radiation

TermDefinition
Radioactivity is the spontaneous decay of unstable nuclei with the release of one or more types of radiation.
Alpha particle are helium nuclei made up of two protons and two neutrons.
Beta particle is an electron with a negative charge and a greater ability to penetrate than alpha particle
Gamma rays are high energy electromagnetic radiation. They are not particles and are usually released in conjunction with either alpha or beta particles
When atom losses alpha particles- it changes into an atom of the element two places before it in the Periodic Table. the mass number of the parent atom decreases by four.
When atom losses beta particles- it changes into an atom of the element one place after it in the Periodic Table. The mass number of the atoms stay the same.
Half-life of an element is the time taken for half of the nuclei in any given sample to decay.
Radioisotope is an isotope of an element that emits radiation.
Nuclear reactions -elements can be changed (transmutation) -change occurs in the nucleus
Chemical reactions -cannot change one element to another -involves sharing and transfer of electrons.
Created by: saoirse sarah