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Type: Multiple-Choice
Category: Atomic Structure
Level: Grade 9
Score: 2
Tags: Atom
Author: Verokert
Last Modified: 3 years ago

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Atomic Structure Question

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Grade 9 Atomic Structure

Potassium has an atomic number of 19 and a mass number of 39. So, it has                 neutrons.
  1. 19
  2. 18
  3. 20
  4. 21
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