Question

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what is afbau principle?


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Answer 1

Answer:

The aufbau principle 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 shell is filled before the 2s subshell is occupied. In this way, the electrons of an atom or ion form the most stable electron configuration possible. An example is the configuration 1s2 2s2 2p6 3s2 3p3 for the phosphorus atom, meaning that the 1s subshell has 2 electrons etc.

Aufbau is a German noun that means construction or "building-up". The aufbau principle is sometimes called the building-up principle or the aufbau rule.

Explanation:

Answer 2

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The German term “Aufbau” means “building up”or “construction”.

Statement:

“Filling up of electrons in atomic orbitals should be in increasing energy level, where the electrons are filled up in lowest energy level first then the highest”

This principle also known as building up principle, which has significant role in filling up of electrons in the atomic orbitals.

By following this principle, the electronic configuration of polyatomic atom is regularized, thereby attains stable atomic configuration.

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