An atom's ability to lose an electron or attract an electron is not created equal! A thorough video lesson explains the concept of shielding and electron affinity. Learners understand the farther an electron is from the nucleus, the harder it is for the nucleus to attract that electron.

Concepts

alkali metals, shields, ionization, ionization energy, electron affinity

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Additional Tags

science

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Instructional Ideas

• Facilitate a think-pair-share activity to activate prior knowledge of alkali metals
• Follow the video with vocabulary review to check for understanding

Classroom Considerations

• Expects an understanding of the reactivity of alkali metals

Pros

• Provides a link to important background information
• Uses an analogy to demonstrate the concept of shielding

Cons

• None