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O Level Chemistry Competitive Exam: Certification Test 812

Periodic Table: O Level Chemistry Quiz App & e-Book: MCQ 812

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MCQ: 812

Which is true about Inert gases?

  1. they have 1-3 valence electrons
  2. they have 4-7 valence electrons
  3. they have stable valence electrons in outermost shells
  4. they have up to 10 valence electrons
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