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Okay so this might sound weird, but when the electrons are not filled into these two orbitals, 3d shell actually does have a higher energy. Therefore, the electrons will fill up 4s orbitals, which are much lower in its energy. However, once the electrons have filled for both shells, the. 4s sub-shell will have higher energy (like two's power level swaps before electrons are filled and after electrons are filled). As a result, it causes the 4s shell to be filled first before 3d shell.
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