The atomic number of lithium is 3. This means that lithium has three protons in its nucleus. The atomic number is a fundamental property of an element as it determines the element’s identity and its position on the periodic table.
In the case of lithium, with three protons, it also has three electrons when it is in its neutral state. This configuration contributes to lithium’s chemical properties, including its reactivity and its role in forming compounds. Understanding the atomic number helps in grasping the basic structure of atoms and how they interact in various chemical reactions.