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CSS Solved Papers
Physics Chemistry

Engineering :: Engineering Materials

  The atomic number of a certain element is 83. An atom of this element must contain
[A]. 42 protons and 41 electrons[B]. 83 neutrous
[C]. 1 neutron, 41 electrons and 41 protons[D]. 83 electrons
[E]. None of the above is valid    

Answer: Option D
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