Question

Define Aufbau principle .​

Answer 1

Answer:

AUFBAU PRINCIPLE

The Aufbau principle, simply put, means electrons are added to orbitals as protons are added to an atom. The term comes from the German word "aufbau", which means "built up" or "construction". Lower electron orbitals fill before higher orbitals do, "building up" the electron shell. The end result is that the atom, ion, or molecule forms the most stable electron configuration.

The Aufbau principle outlines the rules used to determine how electrons organize into shells and subshells around the atomic nucleus.

• Electrons go into the subshell having the lowest possible energy.

• An orbital can hold at most 2 electrons obeying the Pauli exclusion principle.

• Electrons obey Hund's rule, which states that electrons spread out before they pair up if there are two or more energetically equivalent orbitals

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Answer 2

Answer:

The aufbau principle, from the German Aufbauprinzip, “to build” states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s subshell is filled before the 2s subshell is occupied