The electronic configuration of Cr3+ is

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The electronic configuration of Cr³⁺ is

[Ar]3d⁵4s¹

[Ar]3d²4s¹

[Ar]3d³4s⁰

[Ar]3d⁴4s²

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If the electron of a hydrogen atom is present in the first orbit, the total energy of the electron is

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