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The electron configuration 4s²3d³ indicates that the element is in an excited state. In a ground state configuration, the electrons would fill the lower energy orbitals first, which for argon (Ar) would typically be 4s²3p⁶. Since the 3d subshell is higher in energy than the 4s, and is partially filled here, this configuration suggests that one or more electrons have been promoted from their ground state positions, resulting in an excited state.

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