NaAt
sodium astatine compound
Sodium ions can balance At- in simple ionic examples.
What Is the Charge of Astatine?
Astatine commonly forms At- At+ in introductory ionic compounds.
Quick answer: Astatine usually has a common ionic charge of -1 or +1, written as At- or At+.
| Element | Astatine |
|---|---|
| Symbol | At |
| Atomic number | 85 |
| Common ionic charge | -1, +1 |
| Common ions | At-, At+ |
Why Astatine has this charge
Astatine is a halogen. In many binary ionic compounds it forms a -1 ion, though positive oxidation states can appear in oxyanions.
Astatine charge examples
CaAt2
calcium astatine compound
Calcium ions can balance common negative Astatine ions.
FAQ
Is Astatine 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.