What is the formula of the 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 formula of the iodide ion?

Explanation:
The iodide ion is formed when iodine gains one electron, giving it a negative charge on a single iodine atom. That means the formula is I−, where the minus sign shows the extra electron and the single iodine atom confirms it’s a monoatomic ion. Other options describe different species: I3− is a trio of iodine atoms with an overall −1 charge, not the lone iodide ion; IO− (hypoiodite) contains iodine bonded to oxygen with a −1 charge; and I2 is the neutral diatomic molecule, not an ion. So the correct formula for the iodide ion is I−.

The iodide ion is formed when iodine gains one electron, giving it a negative charge on a single iodine atom. That means the formula is I−, where the minus sign shows the extra electron and the single iodine atom confirms it’s a monoatomic ion. Other options describe different species: I3− is a trio of iodine atoms with an overall −1 charge, not the lone iodide ion; IO− (hypoiodite) contains iodine bonded to oxygen with a −1 charge; and I2 is the neutral diatomic molecule, not an ion. So the correct formula for the iodide ion is I−.

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