AP EAMCET · Chemistry · Structure of Atom
In the electronic configuration of which of the given elements, Aufbau principle or \((n+l)\) rule is violated?
- A \(\mathrm{Mn}\)
- B Ga
- C \(\mathrm{La}\)
- D Pu
Answer & Solution
Correct Answer
(C) \(\mathrm{La}\)
Step-by-step Solution
Detailed explanation
Lanthanum has one electron in \(5 d\)-orbital even through, it is before elements with electrons in \(4 f\)-orbitals. It is because in La, the \(4 f\) and \(5 d\) electrons are so close in energy. Therefore, it violates Aufbau principle.
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