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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
Mass number of all elements represents number of ______________?
  • A
    Protons and neutrons
  • B
    Protons and electrons
  • C
    Electrons and neutrons
  • D
    None of the above
✓

Answer

  1. Protons and neutrons

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