Astatine can form salts by reacting with metals or ammonium ions to form ionic compounds. These compounds are typically highly reactive and unstable due to the high reactivity of astatine. Some examples of astatine salts include:

1. Alkali Metal Astatides: Astatine reacts with alkali metals (Group 1 elements) to form alkali metal astatide salts. These salts are highly soluble in water and dissociate to release astatine ions (At-). Examples include sodium astatides (NaAt) and potassium astatides (KAt).

2. Ammonium Astatides: Astatine can also react with ammonium salts to form ammonium astatide salts. These compounds are ionic in nature and contain the ammonium ion (NH4+) and the astatide ion (At-).

It is important to note that due to the limited availability and highly radioactive nature of astatine, the formation and handling of its salts require specialized facilities and strict safety protocols to minimize exposure and potential health risks.