NaI
sodium iodine compound
Sodium ions can balance I- in simple ionic examples.
What Is the Charge of Iodine?
Iodine commonly forms I- I+ I5+ I7+ in introductory ionic compounds.
Quick answer: Iodine usually has a common ionic charge of -1 or +1 or +5 or +7, written as I- or I+ or I5+ or I7+.
| Element | Iodine |
|---|---|
| Symbol | I |
| Atomic number | 53 |
| Common ionic charge | -1, +1, +5, +7 |
| Common ions | I-, I+, I5+, I7+ |
Why Iodine has this charge
Iodine is a halogen. In many binary ionic compounds it forms a -1 ion, though positive oxidation states can appear in oxyanions.
Iodine charge examples
CaI2
calcium iodine compound
Calcium ions can balance common negative Iodine ions.
FAQ
Is Iodine charge the same as oxidation state?
Ionic charge is the charge on an actual ion. Oxidation state is a bookkeeping number used inside compounds. They can match, but they are not always the same thing.
How do I use this in formulas?
Combine positive and negative ions so the total charge is zero. You can also use the ionic compound calculator.
Where can I see the full chart?
Use the periodic table with charges or the ionic charges chart.