Question

What is the reason for the configurations [Ar]3d 5 4s 1 & [Ar]3d 10 4s 1 ?

Answer 1

Answer on Question #54384 – Chemistry – Inorganic Chemistry

Question

What is the reason for the configurations [Ar]3d⁵4s¹ & [Ar]3d¹⁰4s¹?

Answer:

[Ar]3d⁵4s¹ configuration is more stable and energetically preferable than [Ar]3d⁴4s² and [Ar]3d¹⁰4s¹ is more stable than [Ar]3d⁹4s² too (energy subshell “tends” to be half-filled or full-filled).

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