Page 2 - 4.HOME ASSIGNMENT-(AOMIC NUMBER AND MASS NUMBER)
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X                  Y
                       Protons           17               17
                       Neutrons        18               20
                       Find the mass number of X and Y and also the number of electrons.
                       b) If the number of neutrons in an element 10 and its atomic number is 9,
                       find its mass number and the number of electrons in it.











































































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