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Type: Multiple-Choice
Category: Periodic Table and Elements
Level: Grade 7
Score: 1
Author: vita63640
Last Modified: 2 years ago

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Periodic Table and Elements Question

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Grade 7 Periodic Table and Elements

The number of protons in an atom is equal to the                   of the element.
  1. atomic mass
  2. atomic projection
  3. atomic number
  4. total mass
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