Chemistry: Average Atomic Mass (AMU, Daltons, etc.)

Scientists created a new measurement, the atomic mass unit, which is defined as carbon 12 = 12amu. So why isn't carbon listed as having exactly 12 amu on the periodic table? An installment from the Socratica chemistry playlist answers that question and more. It walks viewers through how to solve for atomic mass units, or Daltons, as well.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Create an additional practice problem figuring atomic mass units
Classroom Considerations
  • Relies on prior knowledge of scientific notation and how to calculate numbers with it in addition to isotopes
  • Assumes all young scientists can reference a periodic table during class
  • This resource is only available on an unencrypted HTTP website. It should be fine for general use, but don’t use it to share any personally identifiable information
Pros
  • Provides English closed captioning for visual learners
  • Offers links to suggested resources
Cons
  • None