Question

Why chromium show exceptional electronic configuration?

Answer 1

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There are two main exceptions to electron configuration: chromium and copper. In these cases, a completely full or half full d sub-level is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to a 3d orbital.


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Answer 2

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⚪⚫〰Exceptional Configuration of Chromium 〰⚪⚫
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◼ Chromium has Atomic Number Z = 24 .

◼ So let me first show it's Simple Configuration According to Aufbau's Principle .


$= > > 1s { }^{2} \: 2s {}^{2} \: 2p {}^{6} \: 3s {}^{2} \: 3p { }^{6}4s {}^{2} \: 3d {}^{4}$
◻◼Now , in order to gain Stable Configuration the exceptional Configuration is arranged by Exciting one electron from the S orbital .

$= > 1s {}^{2} \: 2s {}^{2} \: 2p {}^{6} 3s {}^{2} 3p {}^{6} 4s {}^{1} 3d {}^{5}$
Hence , the outer d electron becomes half filled and we know that Half filled and Fully filled configuration is Stable .

➡{ Apart From Chromium , Copper also Shows such Configuration }

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