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protrons

QuestionAnswer
atoms ............................................................................................................smallest unit of matter
scientific modle an idea that us to creat explanations of how we think some part of the world works. similar to a theory.
scientific evidence collection of observation that many people have made. everyone agrees on the same collection of observations.
atomic numbers number of protons in the nucleous of an atom
mass numbers number of protons + number of neutrons
atomic mass "weight" or mass of single atom the same as mass number because most of the weight of an atom is founded in the nucleous eletrons weigh almost nothing