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chem. atoms

atom the smallest unit of matter
scientific model when a model is supported by scientific evidence it is usually accepted by the scientific community
scientific exidence collection of observations that agrees on the same collection of observations
atomic number number of protons in the nucleus of an atom
mass number number of protons+number of neutrons
atomic mass "weight" or mass of a single atom(the same as mass number, because most of the weight of an atom is found in the nucleus- electrons weigh almost nothing)
Created by: zainab.hussein