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Which of the following accurately describes the electronic configuration of Cr3+?

1. Ti has the configuration [Ar]3d2 4s2, and Ti3+ becomes 3d0.
2. Cr has the configuration [Ar]3d5 4s1, and Cr3+ becomes 3d3.
3. Cr3+ exhibits color due to unpaired electrons in its d orbitals.
4. All of the above statements are incorrect.

Correct answer: Cr has the configuration [Ar]3d5 4s1, and Cr3+ becomes 3d3.

Solution

Chromium (Cr) has the electronic configuration [Ar]3d5 4s1. When it loses three electrons to form Cr3+, the configuration becomes [Ar]3d3. This is the correct statement.

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