Question

hii guys how are you all .... what is aufbau principle...:-)♥♥​

Answer 1

I am fine dear ❤

Aufbau principle states that electrons are filled in sub-shell from lower energy level to higher.

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Answer 2

HeYaa ☺️$<b>$

-: Aufbau's Principle :-

✔️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.

⭐️Aufbau is a German noun that means construction or "building-up".Here, it refers to the filling up of orbitals with electrons.

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-:Limitations:-

⭐️Although (n-1) d subshells and ns subshells lie quite close together , yet the former is somewhat higher in energy.

⭐️The Aufbau principle cannot be used to predict electron configuration of atoms on ionization.

⭐️In case of palladium pd (Z=46), the predicted Aufbau configuration is 5s2 4d8 but the experimentally observed configuration is 5s0 4d10. This is perhaps the only case where the observed configuration has two misplaced electron.

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