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Class 9 Chemistry MCQs e-Book PDF | Atomic and Mass Number App Download

Class 9 Chemistry Competitive Exam: Certification Test 18

Atomic and Mass Number MCQs App Download & PDF e-Book - 18

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MCQ: 18

The mass number of an atom is

  1. number of protons only
  2. number of neutrons only
  3. number of electrons
  4. number of protons and neutrons
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Atomic and Mass Number Competitive Exam: Class 9 Chemistry App & eBook MCQs

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