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Why do electrons enter the 4s orbital before entering the 3d orbital

User Minus
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According to the Aufbau principle, the 4s sublevel is filled before the 3d sublevel because the 4s is lower in energy. ... This is why when electrons are lost from the orbitals of the transition metals, they are lost from the 4s first because it is higher in energy
User Sudheesh R
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