In the upload files read to pages 1 -5 and answering the Concept Check
1. Two atoms have the same atomic number, but a different atomic weight. Are they the same element with the same properties?
2. Two atoms have the same atomic weight, but a different atomic number. Are they the same element with the same properties?
3. How is it possible for two atoms to weigh the same amount but not be the same element?
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