Which option is the iodide ion?

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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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