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Type: Multiple-Choice
Category: Periodic Table and Elements
Level: Grade 9
Score: 2
Author: erinferrari
Last Modified: 5 months ago

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Periodic Table and Elements Question

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Grade 9 Periodic Table and Elements

The weighted average of the mass numbers of all the isotopes that occur in nature for a particular element is the average                .
  1. atomic number
  2. atomic mass
  3. mass number
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