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Chemistry-Ch3-LivingbyChemistry

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Term
Definition
atom   the smallest unit of an element that retains all the chemical properties of that element and can exist as a seperate particle  
atomic theory   a theory that states that all matter is made up of individual particles called atoms  
model   A simplified representation of a real object or process that facilitates understanding or explination of that object or person  
nucleus   the dense positively charged structure composed of protons and neutrons that is found in the center of an atom  
proton   a positively charged particle located in the nucleus of an atom. The mas is about 1 amu  
neutron   a particle that is located in the nucleus of an atom and does not have an electric charge; the mass is about 1 amu  
electron   An elementary particle with a negative charge tht is located outside of the nucleus of an atom, has a mass of about 1/1840 amu  
atomic number   equal to the number of protons in an atom and is used to identify an element on the periodic table  
atomic mass   measured in atomic mass units (amu) it is the total mass of protons and neutrons in the nucleus of an atom  
average atomic mass   the average mass of the naturally occuring isotopes of an element  
isotope   atoms of the same element with differing numbers of neutrons  
radioactive isotope   isotopes of an element that are less stable and emit subatomic particles spontaineously over time.  
nuclear reaction   changes in the nucleus of an atom  
readioactive decay   the process of ejecting or emitting pieces from the nucleus of an atom  
fission   the splitting apart of a nucleus  
fussion   the joining of nuclei to form a larger nucleus  


   






 
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Created by: lpgullett