Iodine is an element in Group 7A of the periodic table. Which type of ion does iodine form?

Answer 1

Iodine has a high nuclear charge..........that is not terribly well shielded by its incomplete valence shell of electrons.

..........Iodine thus tends to attract electron density, and the addition of a single electron will provide a full valence shell. Thus it is reduced and forms an #"iodide ion"#, #I^-#. All the halogens form this ion upon reduction:

#1/2X_2+e^(-) rarr X^-#

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Answer 2

Noah Aldrich

Iodine forms the iodide ion (I^-), a monovalent anion with a charge of -1 that is a negative ion.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.