The Electron Configuration: Ions Video Lessons

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Problem: What is the electron configuration for a chloride ion?

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We are asked to determine the electron configuration of a Chloride ion. Recall that a chloride ion has a charge of -1 (Cl-).


We first determine the ground-state electron configuration of a Chlorine atom by referring to the periodic table and locating the position of Cl in the periodic table.

Ground-state means that the element is in its lowest energy form (not in excited state). Ca has no charge which means that no electrons are removed or added in the atom.


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What is the electron configuration for a chloride ion?

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