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Why chromium and copper exhibits such electronic configuration ?

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24Cr – [Ar] 3d5 4s1 

29Cu – [Ar] 3d10 4s1

Why chromium and copper exhibits such electronic configuration ?

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Half filled and completely filled subshells are most stable. Change in the electronic configuration of 24Cr &, 29Cu is due to .this. The electrons in these elements are arranged in such away to give these elements stability

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