Octunseptium (Ous)
Octunseptium is the systematic name of the theoretical 817वाँ element in the periodic table with a symbol of Ous and atomic number of 817. Octunseptium, also known as element 817, has आठ सौ सत्रह protons in its nucleus, and आठ सौ सत्रह electrons in its shells.