Which of the following is NOT a typical cation of chromium?

• A. Cr^{3+}
• B. Cr^{6+}
• C. Cr^{+}
• D. Cr^{2+}

Answer: (B)

Verified step by step guidance

1. Step 1: Understand what a cation is — a positively charged ion formed when an atom loses electrons.
2. Step 2: Recall the common oxidation states of chromium. Chromium typically forms cations with charges +2 and +3, represented as \(Cr^{2+}\) and \(Cr^{3+}\).
3. Step 3: Recognize that \(Cr^{+}\) is less common but can exist as a cation with a +1 charge, though it is rare.
4. Step 4: Note that \(Cr^{6+}\) is not a typical cation; chromium in the +6 oxidation state usually exists as an anion in compounds like chromate (\(CrO_4^{2-}\)) or dichromate (\(Cr_2O_7^{2-}\)), not as a free cation.
5. Step 5: Conclude that among the given options, \(Cr^{6+}\) is NOT a typical chromium cation.