Interpretation:
The Aufbau’s sequence of orbital from
Concept introduction:
The Aufbau Principle states that during writing the electron configuration for an atom, orbitals are filled in order of increasing energy level.

Answer to Problem 84A
Sequence of orbitals from
Explanation of Solution
Aufbau Principle states that in the ground state electrons of an atom fill the orbital with lowest energy first and upcoming electrons are filled in the order of increasing their energies.
The order in which the orbitals are filled with electrons is:
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