Lesson: Electron Affinity Chemistry • Second Year of Secondary School

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In this lesson, we will learn how to define electron affinity and describe and explain trends throughout the periodic table.

Students will be able to

define electron affinity and write chemical equations to show the process,
explain the values for first electron affinities as being positive as energy is released,
explain why values for second electron affinities are usually negative as energy is needed,
describe and explain the trend in electron affinity when descending groups in the periodic table,
describe and explain trends in electron affinity across periods in the periodic table,
describe and explain exceptions or anomalies in trends seen throughout the periodic table,
predict the relative electron affinity of an element based on its position in the periodic table and neighboring elements.