Non-Hodgkin lymphoma is broadly divided into two major groups: B-cell lymphomas (which develop from abnormal B-lymphocytes, which is most common), and T-cell lymphomas (which develop from abnormal T-lymphocytes). Lymphocytes are a type of white blood cell that helps the body fight infections.
The atomic number of radon (Rn) is 86 and the atomic weight of Rn is 222 grams/mole.
The current system of atomic masses was instituted in 1961 and is based on the mass of 12 C (read carbon twelve). By definition the atomic mass of a single 12 C atom is exactly 12 atomic mass units (denoted by the abbreviation amu or u).The masses of all other elements are based on this standard.y definition the atomic mass of a single 12 C atom is exactly 12 atomic mass units (denoted by the abbreviation amu or u). The masses of all other elements are based on this standard.