Ununoctium, also known as element 118 or Uuo, is a synthetic element that was first synthesized in a laboratory in 2002. Its atomic number is 118, indicating that it has 118 protons in its nucleus. Due to its highly unstable and short-lived nature, ununoctium has a number of isotopes with varying atomic masses.
The most stable isotope of ununoctium is ununoctium-294 (Uuo-294), which has a half-life of approximately 0.89 milliseconds. However, the atomic mass of ununoctium can vary depending on the specific isotope being referred to.
the exact atomic mass of ununoctium has not been determined due to its short-lived and synthetic nature. It is challenging to measure the atomic mass accurately for such heavy and unstable elements. However, the atomic mass of the most stable isotope, Uuo-294, is estimated to be around 294 atomic mass units (amu). Please note that these values may be subject to refinement as scientific research progresses.