Question

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.

Explanation:

..........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^-`