To write the complete electron configuration of an ion (charged species), we first need to write its electron configuration in the ground state.
You 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). P has no charge which means that no electrons are removed or added in the atom.
What is the electron configuration of the P3- and Mo3+ ions?
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