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Text File  |  1995-12-08  |  191 b   |  8 lines
  1.     What are two substances with the mass numbers numbers called?
  2. A. Allotropes
  3. B. Isotopes
  4. C. Moles
  5. D. Different elements
  6.  
  7. D
  8. Elements with different atomic numbers must be distinct elements.