Octpentoctium (Opo)
Octpentoctium is the systematic name of the theoretical ٨٥٨. element in the periodic table with a symbol of Opo and atomic number of 858. Octpentoctium, also known as element 858, has ثمانية مائة وثمانية وخمسون protons in its nucleus, and ثمانية مائة وثمانية وخمسون electrons in its shells.