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Atom
Term | Definition |
---|---|
Atom | Basic unit of chemical element |
Electrons | Subatomic particle with negative charges |
Protons | Subatomic particle with positive charges |
Neutron | Subatomic particle with neutral charges |
Nucleus | Central part of atom with protons and neutrons |
Atomic number | Number of protons in the nucleus of an atom |
Atomic Mass | Mass of an atom of chemical element |
Mass number | Total number of protons and neutrons in a nucleus |
Isotope | same form of an element with different number of neutrons |
Average Atomic Mass | Sum of masses of an element's isotopes multiplied by its natural abundance |
Radioactivity | Emission of Ionizing radiation or particles caused by disintegration of the nuclei |
Alpha Particle | A helium nucleus emitted by radioactive substances |
Beta Particle | Fast moving electron emitted by radioactive substances |
Gamma ray | Penetrating electromagnetic radiation |
Half-Life | Time taken for radioactivity of an isotope to fall to half its original value |
Fission | Diving or splitting something into two or more parts |
Fusion | Process or result of joining two or more things to form a single unity |
Critical Mass | Amount of starting material that makes each fission reaction produce at least on more fission reaction |
Chain Reaction | A series of fission reactions caused by neutrons released in each reaction |
Tracer | Radioactive isotope used to find or keep track of a molecule |