Electron configurations of the 3d transition metals | AP Chemistry | Khan Academy

The Aufbau principle predicts that the 4s orbital is always filled before the 3d orbitals, but this is actually not true for most elements! From Sc on, the 3d orbitals are actually lower in energy than the 4s orbital, which means that electrons enter the 3d orbitals first. In this video, we’ll discuss this in more depth and walk through all of the electron configurations for the 3d transition metals. View more lessons or practice this subject at https://www.khanacademy.org/science/a...

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