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Mass Number and Isotopes MCQ App Download | Class 7 Science MCQ Apps (iOS & Android)

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Mass Number and Isotopes MCQ App Download & e-Book | 1428

MCQ: 1428

The 'isotope' carbon-12 makes up about

  1. 90% of carbon on earth
  2. 80% of carbon on earth
  3. 99% of carbon on earth
  4. 89% of carbon on earth

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Mass Number and Isotopes Learning App: Free iOS & Android Apps

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Mass Number and Isotopes Apps (Android & iOS)

Mass Number and Isotopes App

7th Grade Science Apps (Android & iOS)

7th Grade Science App

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