The Aufbau Principle States That an Electron

The Aufbau principle states that electrons will occupy lower energy orbitals before moving on to higher energy orbitals. The aufbau principle ˈ aʊ f b aʊ from the German Aufbauprinzip building-up principle also called the aufbau rule states that in the ground state of an atom or ion electrons fill subshells of the lowest available energy then they fill subshells of higher energy.

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In this way the electrons of an atom or ion.

. For example the 1s subshell is filled before the 2s subshell is occupied. Electrons are filled in the following order according to this principle. The energy of an orbital is calculated by adding the principal and azimuthal quantum numbers.

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p.

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