IGCSE O Level Chemistry Competitive Exam MCQs – Practice Test 5 (Chapter 14)
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MCQ 21: Valence electrons refer to which of the following?
MCQ 22: Chemical properties of an element are largely derived through the:
MCQ 23: Elements and their isotopes have:
MCQ 24: The first element in the periodic table to have 8 valence electrons in the third shell is:
MCQ 25: The isotopes have similar:
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