What is the chemical formula for iodide ion?

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Multiple Choice

What is the chemical formula for iodide ion?

Explanation:
This question tests recognizing what an iodide ion is: a single iodine atom that has gained one electron to become negatively charged. That makes the formula I-, the iodide ion. Iodine has a -1 oxidation state in iodide, and it’s a monoatomic ion, not a molecule. The other options are different iodine species: I2 is elemental iodine, a neutral diatomic molecule; IO- and IO3- are oxygen-containing iodine ions (hypoiodite and iodate), not iodide. So the correct notation for the iodide ion is I-.

This question tests recognizing what an iodide ion is: a single iodine atom that has gained one electron to become negatively charged. That makes the formula I-, the iodide ion. Iodine has a -1 oxidation state in iodide, and it’s a monoatomic ion, not a molecule. The other options are different iodine species: I2 is elemental iodine, a neutral diatomic molecule; IO- and IO3- are oxygen-containing iodine ions (hypoiodite and iodate), not iodide. So the correct notation for the iodide ion is I-.

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