An Element : A substance which cannot be broken down into simple substances by any chemical reaction is called an element. Types of elements : Metals, non-metals and metalloids are the different types of elements. Carbon : Carbon is a non-metallic element. Carbon is the main constituent of all plant and animal products. In nature, it is found in the free state and also in compounds. On complete combustion of any organic compound, carbon dioxide and water are formed. 1. Symbol of carbon – C 2. Atomic number – 6 3. Atomic mass – 12 4. Electron configuration – 2,4 5. Valency – 4 6. Non-metallic element