Class 7 Science MCQs – Certification Test 579

Electron Levels MCQ (Question 579) – Learning App & e-Book Download

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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:

11 and 11
11 and 23
23 and 11
11 and 12

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