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Electron Levels Study App Download - Class 7 Science Apps (Android & iOS)

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Electron Levels MCQ App Download & e-Book PDF - 579

MCQ: 579

The atomic number of sodium is 11 and its atomic mass is 23 and the number of protons and neutrons in an atom of sodium is

  1. 11 and 11
  2. 11 and 23
  3. 23 and 11
  4. 11 and 12

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Electron Levels Apps (Android & iOS)

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