Instructional Video

Why Aren't All Atomic Masses Whole Numbers?

Curated and Reviewed by Lesson Planet

Since an atom can't have a partial neutron, the atomic mass should always be a whole number, but it isn't! An interactive video lesson explains how the atomic mass number from the periodic table incorporates the isotopes of an element. The narrator offers multiple examples calculating the weighted mean mass of an element.

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Instructional Ideas
  • Post the video as a resource for absent pupils and those needing extra instruction
  • Use the questions posed by the narrator as discussion questions in class
Classroom Considerations
  • Expects a solid understanding of atom composition and isotopes
Pros
  • Uses an interactive approach to keep scholars engaged
  • Animations add clarity to the complex concept
Cons
  • None