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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
What is the mass number?
  • A
    The number of neutrons.
  • B
    The number of protons and electrons.
  • C
    The number of protons.
  • D
    The number of protons and neutrons.
✓

Answer

  1. The number of protons and neutrons.

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