Using the periodic table, identify the element with the following exception electron configuration: [Ar]4s¹3d⁵ A) Ni B) Co C) Cr D) Mn E) Fe

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The exception electron configuration shows that the element has a filled 3d subshell and a partially filled 4s subshell. This is characteristic of chromium (Cr), which has the electron configuration [Ar] 3d5 4s1. None of the other options have this same electron configuration.

Using the Periodic Table, Identify the Element with the Following