Assign oxidation numbers to each element in the following compounds. (e) KClO3

Key Concepts

Oxidation Numbers

Oxidation numbers are assigned to atoms in a compound to indicate the degree of oxidation or reduction. They help in understanding electron transfer during chemical reactions. The rules for assigning oxidation numbers include that the oxidation number of an element in its elemental form is zero, and for monoatomic ions, it equals the charge of the ion.

Rules for Assigning Oxidation Numbers

There are specific rules for assigning oxidation numbers, such as oxygen typically having an oxidation number of -2, hydrogen being +1 when bonded to non-metals, and alkali metals (like potassium) always having an oxidation number of +1. In compounds, the sum of oxidation numbers must equal the overall charge of the molecule or ion.

KClO3 Structure

KClO3, or potassium chlorate, consists of potassium (K), chlorine (Cl), and three oxygen (O) atoms. Understanding the structure is crucial for assigning oxidation numbers, as the oxidation state of chlorine can vary depending on its bonding with oxygen. In KClO3, chlorine typically has an oxidation number of +5, balancing the -6 contribution from the three oxygen atoms.