Chemistry / Chem 0865 · Atom · ~20 seconds
Electron Configuration and Periodic Table Blocks
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The periodic table's s, p, d, and f blocks group elements whose highest-energy electron, added last by Aufbau, occupies that subshell type.
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Aluminum sits in the p block because its last-added electron occupies a 3p orbital, matching [Ne]3s²3p¹.
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An element's block is set by which subshell its Aufbau-added electron enters, not by which subshells appear anywhere in its full configuration.