Halogens
The atomic number of chlorine (Cl) is 17. When two chlorine atoms (Cl) combine to form Cl₂, the atomic number remains 17 because it represents the number of protons in the nucleus of each chlorine atom.
The oxidation number of Cl in NaOCl is +1. This is because Na has an oxidation number of +1 and O has an oxidation number of -2, so the oxidation number of Cl must be +1 in order for the overall charge of NaOCl to be neutral.
The oxidation number of Cl in PtCl4^2- is -1. This can be determined by considering that the overall charge of the complex ion is 2-, and each Cl atom has an oxidation number of -1.
The Sulfide ion, S2-, is isoelectronic with Cl-
The oxidation number of Cl in Cl4 is -1. Since there are four Cl atoms, the total charge contributed by Cl is -4, making the oxidation number of each Cl atom -1.
The oxidation number of Cl in NCl3 is -1. Nitrogen typically has an oxidation number of -3 in nitrogen-containing compounds, so the overall charge of NCl3 must be 0, making the oxidation number of Cl -1.
F CL Br I At
The oxidation number for Cl in Cl4 is -1. Since Cl is a halogen, it typically has an oxidation number of -1 when it forms compounds.
In OCl (hypochlorite), the oxidation number of Cl is -1. This is because oxygen has an oxidation number of -2 and the overall charge of the OCl ion is -1, meaning that Cl must have an oxidation number of -1 to balance the charge.
-1 is most common, but Cl can exhibit oxidation numbers from -1 to +7 in its compounds.
The oxidation number of Cl in potassium chlorate (KClO3) is +5. This is because the oxidation number of K is +1 and the oxidation number of O is -2. By using the sum of the oxidation numbers in the compound, the oxidation number of Cl can be calculated to be +5.
The oxidation number for Cl in ClO3 is +5. This is because oxygen has an oxidation number of -2 and there are 3 oxygen atoms in ClO3, resulting in a total oxidation number of -6. The overall charge of the ion is -1, so the oxidation number of Cl must be +5 to balance the charges.