aufbaus principle

It states that filling of electrons take place by filling lower energy orbitals first and then higher energy orbitals and for detecting energy level use n+l rule.
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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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according to Aufbou principle at first electron enters in those orbitals having energy minimum then it enters in further orbital in order of their increasing energy.
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According to Aufbou principle he sais that electrons are filled fristly lowest orbital then higest orbital
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