Which of the following would be true when iodine gains valence electrons? A. it would form a cation with a -1 charge.
B. it would form a cation with a +1 charge.
C. it would form a anion with a -1 charge.
D. it would form a anion with a +1 charge.

C. it would form a anion with a -1 charge.

Explanation:

The elements of group 17 are called halogens.

These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature.  Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.

They require only one electron to complete the octet and get stable. Thus they form anion with charge -1 when they gain electron.

l + e⁻  → I⁻

They form ionic compound with alkali and alkaline earth metal such as sodium chloride (NaCl), Barium iodide (BaI₂) etc.

Properties of Iodine:

1. it is present in solid form.

2. it is crystalline in nature.

3. it is very corrosive and has pungent odor.

4. it can not react with oxygen and nitrogen.

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