A nuclide is a type of Smallest particle of an element which cannot be chemically d... characterized by its Elementary particle with a positive electrical elementary ch... number, Uncharged elementary particle with a mass of 1.67492716 ·10... number and its Ability to do work or diffuse heat. The unit of energy is th... condition. Conditions with a life of less than 10-10s are called excited conditions of a nuclide. At present, approximately 4 000 experimentally observed nuclides and Nuclides of the same neutron and proton numbers, however wit... are known, distributed over the 118 currently known elements. More than 3 700 nuclides of these are radioactive. (See ‘radionuclides’).