In the VIEW menu, go to TEXT SIZE and click on SMALLEST. Complete the crossword, then click on "Check" to check your answer. Almost all the answers are words about periodicity. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number. Good luck! By the time you take A Level Chemistry most clues should be very easy. Dr E.