No, there are no known elements with an atomic number below their place in the periodic table. The periodic table arranges elements in order of increasing atomic number, which is the number of protons in the nucleus of an atom. Elements are organized into periods (rows) and groups (columns) based on their electron configurations and chemical properties.
The discovery and identification of new elements follow a sequential pattern, with each new element having a higher atomic number than the elements discovered before it. the heaviest known element is oganesson (Og) with atomic number 118. Scientists have not yet synthesized or discovered elements beyond oganesson.
It's important to note that the periodic table can be extended theoretically to include elements that have not been synthesized or discovered yet, but their properties and characteristics are still subject to ongoing research and exploration.