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Which one is the correct order of the size of iodine species?

1. I− > I+ > I
2. I > I− > I+
3. I− > I > I+
4. I > I+ > I−

Correct answer: I− > I > I+

Solution

The size of an ion depends on the number of electrons and the effective nuclear charge. I− has the largest size due to the extra electron causing increased electron-electron repulsion, followed by neutral I, and I+ is the smallest due to the loss of an electron, increasing the effective nuclear charge.

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