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Atom

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Atom   Basic unit of chemical element  
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Electrons   Subatomic particle with negative charges  
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Protons   Subatomic particle with positive charges  
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Neutron   Subatomic particle with neutral charges  
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Nucleus   Central part of atom with protons and neutrons  
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Atomic number   Number of protons in the nucleus of an atom  
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Atomic Mass   Mass of an atom of chemical element  
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Mass number   Total number of protons and neutrons in a nucleus  
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Isotope   same form of an element with different number of neutrons  
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Average Atomic Mass   Sum of masses of an element's isotopes multiplied by its natural abundance  
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Radioactivity   Emission of Ionizing radiation or particles caused by disintegration of the nuclei  
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Alpha Particle   A helium nucleus emitted by radioactive substances  
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Beta Particle   Fast moving electron emitted by radioactive substances  
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Gamma ray   Penetrating electromagnetic radiation  
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Half-Life   Time taken for radioactivity of an isotope to fall to half its original value  
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Fission   Diving or splitting something into two or more parts  
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Fusion   Process or result of joining two or more things to form a single unity  
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Critical Mass   Amount of starting material that makes each fission reaction produce at least on more fission reaction  
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Chain Reaction   A series of fission reactions caused by neutrons released in each reaction  
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Tracer   Radioactive isotope used to find or keep track of a molecule  
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Created by: Dante T.
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