Solve this particularly puzzling crossword and you’ll feel like a ’King who’s rich within (5)’

Each crossword square can have one or two letters, which must be letters of an elemental symbol or D and T (for Deuterium and Tritium). For instance D(Al)T(O)Ni(Sm). For the first time in Chemistry World, all 118 elements are used in this puzzle.

To enter an element symbol into a square, you can either double-click the square before starting to type, or just press the shift key while typing.