Give the systematic name for the following polyatomic ion.
AsO₄^3–

• A. arsenate
• B. arsenite
• C. arsenic
• D. hypoarsenate
• E. arsenide

Answer: (A)

Verified step by step guidance

1. Identify the central atom in the polyatomic ion, which is arsenic (As) in this case.
2. Determine the oxidation state of the central atom. For AsO₄³⁻, the oxidation state of arsenic is +5.
3. Recognize the number of oxygen atoms bonded to the central atom. Here, there are four oxygen atoms.
4. Understand the naming convention for polyatomic ions: when the central atom is in its highest common oxidation state and bonded to four oxygens, the suffix '-ate' is used.
5. Combine the root name of the central atom 'arsen-' with the suffix '-ate' to form the name 'arsenate'.