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O Level Chemistry Placement Tests: Certification Test 458

Proton and Nucleon Number MCQs App Download & PDF e-Book - 458

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MCQ: 458

Extra stability is gained in the third shell if the number of electrons is

  1. 18
  2. 2
  3. 8
  4. 10

Proton & Nucleon Number Placement Tests: O Level Chemistry App & eBook MCQs

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Proton and Nucleon Number MCQs App (iOS & Android)

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O Level Chemistry MCQs App (Android & iOS)

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