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| Question | Answer |
|---|---|
| atoms | the smallest unit of matter that has all the properties of matter |
| scientific model | an idea that allows us to create explantionof we think |
| scientific evdience | the collection of the observations that many people have made |
| mass number | number of protons and number of neutrons |
| atomic number | number of protons in the nuclues of an atom |
| atomic mass | weight or mass of a single atom |