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Protons Neutrons and Electrons MCQs App Download & e-Book | 548

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MCQ: 548

Mass of an electron is

  1. 1⁄1840 of a proton only
  2. 1⁄1840 of a neutron only
  3. 1860 times of a proton
  4. 1⁄1840 of a proton and neutron
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