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The aufbau principle (text books may also call it the Madelung ordering or the Klechkowski rule) predicts the order in which orbitals are filled. The 4s orbital is filled before the 3d orbitals. Wikipedia has an article see link

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Q: Why does one electron in a potassium atom go into the fourth energy level instead of squeezing into the third energy level along with eight alredy?
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