please tell me about aufbau principle in 100 words or more
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The Aufbau principle states that, hypothetically, electrons orbiting one or more atoms fill the lowest available energy levels before filling higher levels (e.g., 1s before 2s). In this way, the electrons of an atom, molecule, or ion harmonize into the most stable electron configuration possible.
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Aufbau principle :- Electrons are placed one by one in orbitals in the increasing order of energy level
the order of increasing energy level can be calculated by (n + l) rule , according to which ,
1) lower the value of ( n + l ) , lower is the energy of the orbital.
2) if ( n + l) value is same for two orbitals , the orbital with lower ' n ' value has lower energy and filled first .
the order in which electrons are filled in the orbitals , according to this rule is ,
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s< 6d < 7p
if you learn concept then , no required to remember this series of energy level, you can easily say that next which will come .
the order of increasing energy level can be calculated by (n + l) rule , according to which ,
1) lower the value of ( n + l ) , lower is the energy of the orbital.
2) if ( n + l) value is same for two orbitals , the orbital with lower ' n ' value has lower energy and filled first .
the order in which electrons are filled in the orbitals , according to this rule is ,
1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s< 6d < 7p
if you learn concept then , no required to remember this series of energy level, you can easily say that next which will come .
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