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Type: Multiple-Choice
Category: Periodic Table and Elements
Level: Grade 10
Author: abrown1201
Last Modified: 7 months ago

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Periodic Table and Elements Question

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Grade 10 Periodic Table and Elements

Which of the following lists contains elements with seven electrons in their outermost energy levels?
  1. He, Ne, and Ar
  2. Cr, Mn, and Fe
  3. Br, I, and Cl
  4. O, S, and Se
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