How can atoms with different masses be the same element? An interactive video lesson describes the meaning of an isotope. The instructor emphasizes the relationship among the subatomic particles. The lesson continues by discussing electron shells and their connection to the periodic table.

Concepts

atoms, isotopes, atomic mass number, the periodic table, electron shells, protons, neutrons, electrons

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Additional Tags

science

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Instructional Ideas

• Pause the video when the instructor poses a question to discuss as a class
• Follow the video with problems to practice using the atomic number and mass number

Classroom Considerations

• Requires a familiarity with the periodic table

Pros

• Video includes a summary of important concepts
• Emphasizes vocabulary throughout the lesson

Cons

• None