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Type: Multiple-Choice
Category: Periodic Table and Elements
Level: Grade 7
Score: 1
Author: adamstein
Last Modified: 4 months ago

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Periodic Table and Elements Question

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Grade 7 Periodic Table and Elements

An atom of iron has 26 protons and 30 neutrons. The mass number of iron is                .
  1. 56
  2. 30
  3. 26
  4. 4
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