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can anyone plzz tel me the sequence of electron filling in orbitals

6 years ago

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Answers : (4)

										

Dear Polisetti


Electrons fill orbitals starting at the lowest available (possible) energy states before filling higher states (e.g. 1s before 2s). The number of electrons that can occupy each orbital is limited by the Pauli exclusion principle. If multiple orbitals of the same energy are available, Hund's rule states that unoccupied orbitals will be filled before occupied orbitals are reused (by electrons having different spins).


So orbitals with a lower n+l value are filled before those with higher n+l values. The rule is based on the total number of nodes in the atomic orbital, n+l, which is related to the energy.In the case of equal n+l values, the orbital with a lower n value is filled first.


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6 years ago
										

The Aufbau principle states that in the ground state of an atom, an electron enters the orbital of lowest energy first, and then the subsequent electrons are fed in the order of increasing energies into the orbitals. The following sequence is observed for orbitals in the increasing energy:1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s.


Or you can understand by this diagram too.


1649_12765_energy-levels-sequence-diagram.jpeg


 


Please do reply ffor this post.......if you like it......


 


thanks....

6 years ago
										

The Aufbau principle (from the German Aufbau meaning "building up, construction": also Aufbau rule or building-up principle) is used to determine the electron configuration an atom molecule or ion. The principle postulates a hypothetical process in which an atom is "built up" by progressively adding electrons. As they are added, they assume their most stable conditions with respect to the nucleus and those electrons already there.


According to the principle, electrons fill orbitals starting at the lowest available (possible) energy states before filling higher states (e.g. 1s before 2s). The number of electrons that can occupy each orbital is limited by the Pauli exclusion principle. If multiple orbitals of the same energy are available, Hund's rule states that unoccupied orbitals will be filled before occupied orbitals are reused (by electrons having different spins).


312_25224_madelung


2001_25224_madelung

6 years ago
										

1s     


2s     2p


3s     3p      3d


4s     4p      4d      4f


5s     5p      5d      5f


6s     6p      6d


7s     7p

6 years ago

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