Yes, the atomic number of an element can provide information about its radioactivity. However, it is not the sole determining factor. Radioactivity depends on the stability of an element's nucleus, which is determined by the balance between protons and neutrons.
Elements with atomic numbers (number of protons) higher than 83 (bismuth) tend to be radioactive. These elements have unstable nuclei that undergo radioactive decay to achieve a more stable configuration. They typically emit radiation in the form of alpha particles, beta particles, or gamma rays.
For example, elements such as uranium (atomic number 92) and plutonium (atomic number 94) are radioactive. Their unstable nuclei result in the emission of radiation and the eventual transformation into other elements over time.
However, it's important to note that not all elements beyond atomic number 83 are radioactive. Some elements, like lead (atomic number 82), have stable nuclei despite having a relatively high atomic number. So while the atomic number can provide a general indication of an element's potential radioactivity, it is not the only factor to consider.