Name the element given clues on a 30-20-10 basis.      A. Because one of it
Name the element given clues on a 30-20-10 basis.      A. Because one of its major ores interfered with the smelting of tin, it was originally known as spumi lupi. All of its compounds are considered highly toxic, and its carbide is important to the metal-working, mining, and petroleum industries.      B. First isolated by Karl Wilhelm Scheele, its current name comes from the Swedish for "heavy stone." China produces almost 75% of the world's supply per year.      C. Today, it is used in steel alloys, electrical contacts, and electric light filaments.
Name the element given clues on a 30-20-10 basis.      A. Because one of its major ores interfered with the smelting of tin, it was originally known as spumi lupi.