What is electron affinity? What are the observed periodic trends in electron affinity?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter5: Electron Configurations And The Periodic Table
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What is electron affinity? What are the observed periodic trends in electron affinity?

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Electron affinity is the energy that released when a neutral gaseous atom captures an electron. The electron affinity for non-metal is negative and for the metal it is positive.

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