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Mass Number and Isotopes MCQs (Question 2) – App & e-Book Download

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MCQ 2: To find out number of neutrons in an atom, we need to know the:

  1. atomic number
  2. proton number
  3. electron number
  4. mass number
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Class 7 Science MCQs App & e-Book – Mass Number and Isotopes Exam Prep

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