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Type: Multiple-Choice
Category: Periodic Table and Elements
Level: Grade 9
Score: 1
Author: erinferrari
Last Modified: 5 months ago

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Periodic Table and Elements Question

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Grade 9 Periodic Table and Elements

What is the sum of the number of protons and the number of neutrons in an atom called?
  1. atomic number
  2. atomic mass
  3. mass number
  4. none of the above
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