Diatomic molecules are molecules composed of two atoms, which can be of the same or different elements. Common examples include oxygen (O2), nitrogen (N2), and hydrogen (H2). These molecules are fundamental in chemistry and play crucial roles in various biological and physical processes. In nature, diatomic molecules are often found in their gaseous state and are essential for life. For instance, oxygen is vital for respiration in many organisms, while nitrogen is a key component of the atmosphere. Understanding diatomic molecules helps in studying chemical reactions and the behavior of gases.