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Living structures are three-dimensional (3D), and electrons move in three-dimensional orbitals. This feature is critical because it explains how elements join to form 3D molecules that build the tissues and organs of life. Watch this lecture, which describes how the electrons move in different orbitals.
Source: Khan Academy, https://youtu.be/HKQCdYgz45g This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.