What is the oxidation number of chlorine?

Question

What is the oxidation number of chlorine?

Answer 1

commonly -1 in compounds and ionic solution. 0 as diatomic chlorine.

See rule----

1. Elements - The oxidation number of an atom in an element is zero.

2. Monoatomic ions - The oxidation number of an atom in a monoatomic ion equals the charge on the ion.

3. Oxygen - The oxidation number of oxygen is -2 in most of its compounds. (An exception is O in H2O2 and other peroxides, where the oxidation number is -1).

4. Hydrogen - The oxidation number of hydrogen is +1 in most of its compounds. (THe oxidation number of hydrogen is -1 in binary compounds with a metal, such as CaH2).

5. Halogens - The oxidation number of flourine is -1 in all of its compounds. Each of the other halogens (Cl, Br, I) has an oxidation number of -1 in binary compounds, EXCEPT when the other element is another halogen above it in the periodic table or the other element is oxygen.

6. Compounds and ions - The sum of the oxidation numbers of the atoms in a compound is zero. The sum of the oxidation numbers of the atoms in a polyatomic ion equals the charge on the ion.

Answer 2

The oxidation number of chlorine is -1.

Answer 3

You need to see the chemical equation to get the oxidation number of chlorine. In HCl, it is -1.

But in HCLlO4, it is +7. It´s a variable, that you can see by doing the nox calculation.

I don´t speek english very well, but I hope you understand.