Oganesson (118 Og) is a synthetic element created in particle accelerators, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes.The first and only isotope to be synthesized was 294 Og in 2002 and 2005; it has a …

Carbon is a very important chemical element, with a chemical symbol of C.All known life on Earth needs it. Carbon has atomic mass 12 and atomic number 6. It is a nonmetal, meaning that it is not a metal.. When iron is alloyed with carbon, hard steel …