Question:
The set of elements which has exceptional electronic configurations not obeying Aufbau principle is}
The set of elements which has exceptional electronic configurations not obeying Aufbau principle is}
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The most common exception elements to remember are:
\[
\text{Cr, Cu, Ag}
\]
and similar transition metals with half-filled or fully filled \(d\)-subshell stability.
Updated On: Apr 24, 2026
- K, Ca, Cr \& Cu
- Ca, Cr, Nb \& Cu
- Ca, Cr, Ag \& Cu
- Cr, Cu, Ag \& Ru
- Na, Rh, Cr \& Cu
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The Correct Option is D
Solution and Explanation
Some elements show exceptional electronic configurations due to extra stability of half-filled or fully filled subshells.
Common examples are:
\[
\text{Cr},\ \text{Cu},\ \text{Ag},\ \text{Ru}
\]
For example:
\[
\text{Cr}: [Ar]\,3d^5 4s^1
\]
instead of
\[
[Ar]\,3d^4 4s^2
\]
\[
\text{Cu}: [Ar]\,3d^{10}4s^1
\]
instead of
\[
[Ar]\,3d^9 4s^2
\]
Thus the correct set is:
\[
\boxed{\text{Cr, Cu, Ag and Ru}}
\]
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