Unbinilium is a hypothetical (theoretical or imagined) element of the periodic table. It is also known as eka- radium. The atomic number of this element is 120. It has the symbol Ubn. The name Unbinilium and the symbol Ubn are temporary IUPAC names. This name and symbol exist until a permanent name is decided. It is expected to be a S-block element and an alkaline earth metal. It is the second element in the eighth period of the periodic table.