Concise Selina Solutions for Class 8 Chemistry Chapter 3 Elements, Compounds and Mixtures

Compounds are substances made from atoms of different elements joined by chemical bonds. A chemical reaction can only separate them. A mixture is made by thoroughly mixing elements and compounds. No new chemical bonds are formed.

Elements: Element contains just one type of atom. The elements are arranged in the periodic table and are split into either metallic or non-metallic. Metallic is further divided into Main Group Metals, Transition Metals, and f-block metals, which are additionally divided depending upon their properties.

Compounds: Compound contains two or more types of atom joined together. Compounds are divided into two, the molecular compounds, and Salts. The atom binds each other through covalent bonds in molecular compounds while it is held together with ionic bonds in salts.

Mixtures: Mixtures contains two or more different substances that are not joined together. Elements or compounds can be the other materials that constitute a mixture.