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  3. Unit 1: levels of organization
  4. The chemical level of organization
  5. Elements and atoms: the building

2.1 Elements and atoms: the building blocks of matter  (Page 21/27)

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  • Card 21 / 27:
    mass number

    sum of the number of protons and neutrons in the nucleus of an atom

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Practice MCQ 5 FlashCards 3 Key Terms 14

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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