Chapter 4: Class 9 Chemistry Exam Tests
Class 9 Chemistry MCQs - Chapter 4
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MCQ 1: Both elements of 1st period contain valence electrons in
MCQ 2: In the periodic table, helium is placed at
MCQ 3: Across the period the atomic size decreases due to
MCQ 4: The first three periods are
MCQ 5: On basis of electronic configuration the group and period of 95B is
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