The atomic mass of an element and the mass number of an atom of that element often have similar values. However, atomic mass and mass number are not the same. Explain the difference.
The atomic number and atomic mass are similar but not the same thing.the atomic mas is the neutrons plus the protons .Also the atomic mass is changed when a isotope occurs.The atomic number tells the number of protones in an element.Also they are categorized by the atomic number.They smilier are that they both tell the number of protones in an element.The difference is that the number tells where the element belongs and the mass changes if an isotope
occurs.
http://en.wikipedia.org/wiki/Atomic_number
http://en.wikipedia.org/wiki/Mass_number
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