After the 5s subshell of an atom is filled with electrons, the next electron added will enter the ________.

Name: After the 5s subshell of an atom is filled with electrons, the next electron added will enter the ________.
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According to the Aufbau principle, after filling the 5s subshell, electrons next fill the 4d subshell. This is because the energy of the 4d subshell is lower than that of the 5p and 5f subshells, making it the next available energy level for electron occupancy.

After the 5s Subshell of an Atom Is Filled with Electrons