What is the chemical formula for iodide ion?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

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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