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Type: Multiple-Choice
Category: Periodic Table and Elements
Level: Grade 10
Score: 3
Author: HSimpson74
Last Modified: 5 months ago

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Periodic Table and Elements Question

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Grade 10 Periodic Table and Elements

The atomic mass of an element is the sum of                      and                     .
  1. protons / electrons
  2. neutrons / protons
  3. neutrons / electrons
  4. protons / particles
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