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Type: Multiple-Choice
Category: Periodic Table and Elements
Level: Grade 7
Score: 3
Author: eMmagG
Last Modified: a month ago

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Periodic Table and Elements Question

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Grade 7 Periodic Table and Elements

Periodic means                                     .
  1. happening at regular intervals
  2. happening very rarely
  3. happening frequently
  4. happening three or four times a year
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