Adjust the font size for the page - View menu, Text size, Smallest. Complete the crossword, then click on "Check" to check your answer. 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.

			1			2		3		4		5
6		7			8
9
				10		11										12
															13
14						15	16							17
		18													19
									20		21			22
	23
24									25			26
		27
28	29									30
31			32		33											34
35									36		37
		38				39			40
					41

 Check 

Across: 7. Abbreviation for cochlear implant (a hearing aid). 8. Element present in the semiprecious stone, beryl. 9. Element which rusts when exposed to air and water. 11. The most abundant gas in air. 13. Chemical symbol for nickel. 14. File extension required to run a computer program. 15. Element required to make strong bones and teeth. 17. Liquid mineral from which petrol is made. 18. Common name for iron which has reacted with water and oxygen.. 19. Symbol for lithium. 20. Element which is the gas used to fill lighter than air balloons. 23. Element above sodium in the periodic table. 25. Element which "pops" when ignited (in air). 27. Element which is commonly a non metallic black solid (and much more rarely is diamond). 28. Abbreviation for liquid crystal display, often used for the screens of calculators. 30. Element required for combustion and respiration. 31. Element below sodium in the periodic table. 35. Symbol for mercury. 36. Element often used to kill bacteria in the domestic water supply. 38. Element above aluminium in the periodic table. 40. Chemically, the salt used to put on chips is _ _ _ _ _ _ chloride. 41. Happy sound.

Down: 1. Element used to protect food cans from rusting. 2. Element used to make coloured lights. 3. A natural blemish (like a spot) which can form on the skin. 4. Element which can be added to water supplies to strengthen teeth. 5. Public building used to keep old objects. 6. Element with the chemical symbol Ni (often used to make ball bearings). 7. Element used to conduct electricity. 10. A non metallic element which glows in the dark. 12. The element used to make computer chips. 13. Nothing. 16. Element used to make kitchen foil. 20. Sound of 40 across. 21. Top of bottle or jar. 22. Element which burns with an intense white light. 24. Element which is a yellow solid. 26. Beam (of light). 27. Craft, Design and Technology. 29. Rotating part of a machine. 32. Noble gas which forms almost 1% of air. 33. Sort of seat used in laboratories. 34. Element used to make the joints in roofs waterproof. 36. Money (in the pocket). 37. (Outdoor) swimming pool. 39. Symbol for sodium.