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The Atomic Number (Z) of Na = 11
The Mass Number (A) of Na = 23
Number of Neutrons = A - Z = 23 - 11 = 12
Its atomic model is shown below:
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Define the following terms —
(a) atomic number and (b) mass number.
What are isotopes? Give one example.
Name the three constituents of an atom and state mass and charge of each. How are they distributed in an atom?
What are isobars? Give one example.
