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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
Created by: lpgullett