According to the Aufbau principle, which of the following orbitals should be filled first to achieve the lowest energy electronic configuration?

Question

BlackTom AI · Accepted Answer

The question asks: According to the Aufbau principle, which orbital should be filled first to achieve the lowest energy electronic configuration?

First, note that the provided data includes no answer options to evaluate individually. Without the list of choices, we cannot systematically compare alternatives. However, we can still apply the Aufbau principle to identify the correct orbital that should be filled first in the sequence of building up electron configurations.

The Aufbau principle states that electrons occupy the available orbitals starting with the lowest energy, and each subsequent electron fills the next orbital of lowest energy, subject to electrons obeying the Pauli exclusion principle and Hund's rule. In practice, this creates a filling order roughly described by the sequence: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, and so on (with small deviations due to subshell energy differences in transition metals).

Given this, the very first orbital to be filled for any atom is the 1s orbital, not a higher-energy orbital like 5p. If someone claims that 5p should be filled first, that would contradict the Aufbau framework because 5p lies much higher in energy than 1s and would only be filled after all lower-energy orbitals in the sequence have been accommodated.

In general, when evaluating any provided options for this question, you would compare each listed orbital against the Aufbau ordering. An option corresponding to 1s would be correct for achieving the lowest energy configuration; an option corresponding to a higher-energy subshell that appears later in the order (such as 5p) would be incorrect as the first orbital to fill.

If any typical distractors were present, such as 2p, 3d, or 4s, you would evaluate them against the known filling sequence: 1s before 2s and 2p, 3s before 3p, 4s before 3d, and so on. Understanding the relative energies of subshells (and the occasional small shifts due to electron shielding and penetration) helps justify why the early orbitals in the sequence are filled before later ones.

In summary, based on the Aufbau principle, the orbital that should be filled first to achieve the lowest energy configuration is 1s. A claim that 5p should be filled first indicates a misunderstanding of the standard filling order, unless the context explicitly involves a highly excited state or a specific unusual configuration, which is not typical for establishing ground-state energy ordering.

According to the Aufbau principle, which of the following orbitals should be filled first to achieve the lowest energy electronic configuration?Single choice

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