Which option is 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

Which option is the iodide ion?

Explanation:
The iodide ion is the negatively charged form of iodine. It carries one extra electron, giving it a charge of − and the symbol I−. That’s why the option showing iodine with a minus sign is the iodide ion. The other possibilities don’t fit: I+ would be positively charged, which isn’t iodide; I2− isn’t a standard simple ion; I3− is the tri-iodide ion, a different species formed from I− and I2, not just iodide alone.

The iodide ion is the negatively charged form of iodine. It carries one extra electron, giving it a charge of − and the symbol I−. That’s why the option showing iodine with a minus sign is the iodide ion. The other possibilities don’t fit: I+ would be positively charged, which isn’t iodide; I2− isn’t a standard simple ion; I3− is the tri-iodide ion, a different species formed from I− and I2, not just iodide alone.

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