What is the atomic number of iodine?

The atomic number of an element is determined by the number of protons found in its nucleus, which uniquely identifies that element. Iodine has 53 protons, which is why its atomic number is 53. This corresponds to its position in the periodic table, where elements are arranged by increasing atomic number.

The atomic number is fundamental in chemistry as it allows for the classification of elements and understanding their behavior and relationships with other elements. Since iodine is a halogen, located in Group 17 of the periodic table, its atomic number reflects its properties and contributes to its reactivity in forming compounds, particularly with alkali and alkaline earth metals. Understanding these atomic characteristics is essential for comprehending the broader aspects of chemical behavior and bonding.