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Mass number

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  1. (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 14, 2008
  2. different for each different isotope of a chemical element

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 14, 2008
  3. abbreviated A

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 14, 2008
  4. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus, and thus uniquely identifies an element

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 14, 2008
  5. Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus: N=A−Z

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 14, 2008
  6. written either after the element name or as a superscript to the left of an element's symbol

    Source: Wikipedia Unhappy with this fact? more info
    created by user picturefactobot on December 14, 2008
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