Q13 of 22 Page 174

Why there are exemptions in writing the electronic configuration of Chromium and copper?

In these cases, a completely full (d10) or half full (d5) d-orbital is more stable than a partially filled d sub shell, so an electron from 4s gets excited and rises to 3d orbital. This makes them stable.


Expected configurations based on Aufbau principle –


Cr – [Ar]4s23d4


Cu – [Ar]4s23d9


Actual configurations


Cr – [Ar]4s13d5


Cu – [Ar]4s13d10


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i. An electron in an atom has the following set of four quantum numbers to which orbital it belong to:


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