Question

Which letter dose not appear in chemical symbol of any elements in the periodic table

Answer 1

Letter Q

Note that the letter "Q" doesn't seem in any official part names. Temporary part names, like ununquadium, contain this letter. However, no part name starts with letter 'Q' of the alphabet and no official part name contains this letter. Once the ultimate four parts on this table get official names, there'll be no letter of the alphabet on the table. The extended table, which incorporates undiscovered super heavy parts (atomic numbers larger than 118), would still contain the letter letter of the alphabet in temporary part names.