The crossword solution for the term 'Light White Metallic Element' is Beryllium, which is a chemical element with the symbol Be and atomic number 4. It is a relatively rare element in the universe, usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays. Beryllium is a steel-gray, strong, lightweight and brittle alkaline earth metal. It has one of the highest melting points among all the elements and it is used in nuclear reactors, aircraft and spacecraft parts, and X-ray machines.