Electronic configuration in Copper is -Ar- 4s1- 3d10 and not -Ar- 4s2- 3d9

Copper #160;has #160;atomic #160;number #160;29.The #160;expected #160;electronic #160;configuration #160;is #160;[Ar] #160;4s23d9. #160;B ...

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Electronic configuration in Copper is [Ar] 4s¹, 3d¹⁰ and not [Ar] 4s², 3d⁹

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$C o p p e r h a s a t o m i c n u m b e r 29 . T h e e x p e c t e d e l e c t r o n i c c o n f i g u r a t i o n i s [A r] 4 s^{2} 3 d^{9} . B u t i t h a s a c o n f i g u r a t i o n o f [A r] 4 s^{1} 3 d^{10} . T h i s i s d u e t o t h e f a c t t h a t h a l f f i l l e d a n d f u l l y f i l l e d o r b i t a l s a r e m o r e s t a b l e t h a n p a r t i a l l y f i l l e d o r b i t a l . I n [A r] 4 s^{2} 3 d^{9}, f r o m s o r b i t a l i f y o u t r a n s f e r 1 e l e c t r o n t o 3 d o r b i t a l b o t h t h e o r b i t a l s w i l l g e t s t a b i l i t y m o r e a s t h e y b e c o m e 4 s^{1} 3 d^{10} . T h a t i s w h y t h e c o p p e r c o n f i g u r a t i o n i s [A r] 4 s^{1} 3 d^{10}$

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In the structure of copper sulphate(CuSO4.5H2o),4 water molecules are coordinated and 1 is hydrogen bonded. The electronic configuration of Cu is [Ar]4s¹3d¹⁰. When the water molecules are sharing 8 electrons, it becomes 4s2 3d10 4p6 5s1. When cu becomes cu2+ion, the configuration becomes 4s2 3d10 4p5. But these 2 configurations aren't stable. Then why did cuso4.5h2o occurs at a reasonably good amount in nature. Kindly explain in "detail"?

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