Yes, the atomic number is a periodic property. The atomic number of an element corresponds to the number of protons in the nucleus of its atoms. In the periodic table, elements are arranged in order of increasing atomic number, which creates a periodic pattern of elements with similar chemical properties. This arrangement is known as the periodic law, and it forms the basis of the periodic table's structure. Elements in the same column, called a group or family, often exhibit similar chemical behavior due to their shared valence electron configuration, which is directly related to their atomic numbers.