Question

fill in the blank question
the aufbau principle states that each electron occupies the energy orbital available.
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Explanation:

The Aufbau principle is a fundamental concept in chemistry. It dictates the order in which electrons fill atomic orbitals. The key idea is that electrons will first occupy the orbitals with the lowest energy levels. This principle helps in understanding the electron configuration of atoms. For example, in hydrogen (\(H\)) with one electron, it goes into the \(1s\) orbital (the lowest - energy orbital). As we move to atoms with more electrons, like helium (\(He\)) with two electrons, both electrons fill the \(1s\) orbital before moving to higher - energy orbitals according to the Aufbau principle. So, the word that fills the blank is "lowest".

Answer:

lowest