- refractory nuclide
- изотоп тугоплавкого элемента
English-Russian small dictionary of medicine. 2015.
English-Russian small dictionary of medicine. 2015.
Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of … Wikipedia