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Electronic Configuration of d-Block Elements

Which of the ...

Question

Which of the following is outer electronic configuration of Cr and Cu?

Cr( 3d ⁴4s²) , Cu(3d¹⁰4s¹)

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Cr(3d ⁴4s²) , Cu(3d ⁹4s²)

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Cr( 3d⁵4s¹) , Cu(3d ⁹4s²)

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Cr(3d⁵4s¹), Cu(3d¹⁰4s¹)

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Solution

The correct option is D
Cr(3d⁵4s¹), Cu(3d¹⁰4s¹)

The half filled 3d⁵ and fully filled 3d¹⁰ configurations are more stable than 3d⁴ and 3d⁹.

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