what is Aufbau's principle?
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The aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levelsbefore occupying higher levels.
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Aufbau principle states that “electrons enter into the orbitals in the increasing order of their energy” this means that electrons occupy the lowest energy orbital first
EXAMPLE : let us consider 3d and 4s orbital. The (n+1) value of 3d orbital = (3+2) =5 and for 4s orbital = (4+0) = 4 hence 4s orbital has lower energy than 3d orbital. So it is filled before 3d orbital
EXAMPLE : let us consider 3d and 4s orbital. The (n+1) value of 3d orbital = (3+2) =5 and for 4s orbital = (4+0) = 4 hence 4s orbital has lower energy than 3d orbital. So it is filled before 3d orbital
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