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------------------------------------------------ Why does the 4s orbital begin to fill before the 3d orbital?

A. The 4s orbital is lower than the 3d orbital in the Aufbau diagram.
B. s orbitals always fill before d orbitals.
C. The 4s orbital is to the left of the 3d orbital in the diagram.
D. The 4s orbital has higher energy than the 3d orbital.

Answer :

Answer:

a. The 4s orbital is lower than the 3d orbital in the Aufbau diagram.

Explanation:

In the Aufbau principle, orbitals are filled in order of increasing energy. The 4s orbital is lower in energy than the 3d orbital when it comes to filling the electron shells, which is why it fills first.

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