Grab your periodic table - this jumbo cryptic chemistry crossword only uses letters found in elemental symbols

In this fiendish cryptic crossword, each square can contain one or two letters, which must be letters of an elemental symbol (H, He, Li etc.), or the letters D or T (for deuterium or tritium). For example, Dalton could be written D(Al)TON.

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.