Mass Number - structure of atom

Discussion in 'CBSE Class 9 Chemistry Help' started by phani, Jan 1, 2012.

  1. phani

    phani Member Staff Member

    Mass Number - structure of atom
    • Mass number is defined as the total number of protons and neutrons, i.e., the number of nucleons
    present in the nucleus of an atom of the element.
    • It is approximately equal to the atomic mass and denoted by A.
    A = Number of protons + Number of neutrons
    = Z + Number of neutrons
    = Number of nucleons
    + Atomic mass is the relative atomic mass of an element found in comparison to the mass of C-12 isotope.

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