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

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We are being asked to determine the electron configuration of the phosphide ion, P3-.

To do this, we can determine the ground-state electron configuration of Phosphorus (P) by referring to the periodic table and locating the position of P in the periodic table.

Ground-state means that the element is in its lowest energy form (not in excited state). 


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What is the electron configuration for a phosphide ion?