"Radium" itself belongs to the elements existing in nature. Madame Curie's discovery of radium belongs to scientific discovery, and according to the current patent law, it does not belong to the patent right category. However, the equipment and methods for preparing and extracting radium, as well as radium compounds that do not exist in nature, can all apply for patents.
Because the patent laws vary greatly in different regions and times, it may be possible to apply for a patent for radium that year.