Chapter 2: Class 7 Science Exam Tests
Class 7 Science MCQs - Chapter 2
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MCQ 96: Scientists name isotopes by putting
MCQ 97: 'Nucleus' is surrounded by
MCQ 98: The orbits on which electrons revolve around the nucleus are called
MCQ 99: Ion with positive charge is known as
MCQ 100: The positive electrical charges of protons are balanced by
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