Question

what is a aufbau principle​

Answer 1

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The Aufbau principle dictates the manner in which electrons are filled in the atomic orbitals of an atom in its ground state. It states that electrons are filled into atomic orbitals in the increasing order of orbital energy level. According to the Aufbau principle, the available atomic orbitals with the lowest energy levels are occupied before those with higher energy levels.

The word ‘Aufbau’ has German roots and can be roughly translated as ‘construct’ or ‘build up’. A diagram illustrating the order in which atomic orbitals are filled is provided below. Here, ‘n’ refers to the principal quantum number and ‘l’ is the azimuthal quantum number.

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Answer 2

Answer:

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The aufbau principle says that the arrangement of electrons in an atom - the electron configuration - is best understood if it is built from the ground up.

'Aufbauprinzip' is a German noun; it means 'construction principle.'

When writing down an atom's electron configuration, we begin at the lowest energy level and add electrons to higher energy sublevels until the required number of electrons are present.

We do so in accordance with the Pauli Exclusion Principle and Hund's Rule.

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