Oxidation sates of chlorine,flourine ,bromine , iodine ,astatine ?

The oxidation states of the halogens (chlorine, fluorine, bromine, iodine, astatine) can vary, but here are the most common ones:

1. Fluorine: Fluorine is the most electronegative element, so it always has an oxidation state of -1 in its compounds.

2. Chlorine: Chlorine can have oxidation states from -1 to +7. In its elemental state (Cl2), the oxidation state is 0. In its ionic state (Cl-), the oxidation state is -1. In compounds like HClO4, the oxidation state is +7.

3. Bromine: Bromine can have oxidation states from -1 to +7. In its elemental state (Br2), the oxidation state is 0. In its ionic state (Br-), the oxidation state is -1. In compounds like HBrO4, the oxidation state is +7.

4. Iodine: Iodine can have oxidation states from -1 to +7. In its elemental state (I2), the oxidation state is 0. In its ionic state (I-), the oxidation state is -1. In compounds like HIO4, the oxidation state is +7.

5. Astatine: Astatine is a radioactive element and not much is known about its compounds. However, it is expected to follow the same trend as the other halogens, with possible oxidation states from -1 to +7.