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Proton and Nucleon Number Quiz App & e-Book Download - 61

MCQ:

If the nucleon (mass) and proton (atomic) number is 40 and 20 respectively, the element is

  1. chlorine
  2. phosphorus
  3. potassium
  4. calcium

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Proton and Nucleon Number App (Android & iOS)

Proton and Nucleon Number App (Android & iOS)

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O Level Chemistry App (iOS & Android)

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9th Grade Chemistry App (iOS & Android)