Complete the crossword, then click on "Check" to check your answer. Almost all the answers are words about atomic structure and the Periodic Table. 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 GCSE Chemistry most clues should be very easy. Dr E.

	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

 Check 

Across: 1. These metals or their compounds often behave as catalysts. 6. Vertical column of elements. 7. See 2 down. 9. Nuclear fusion of hydrogen into helium atoms gives liight and heat from this; it also goes "Twinkle, twinkle...". 10. Flightless bird. 11. Number of electrons in the outer orbit of 2 down, 7 across. 14. Having a fine view ... of a car? 15. Fault-finding fish. 18. Relationship between the physical and chemical properties of members of a Group. 19. The number of electrons in the outer orbit of carbon. 20. Symbol for technetium. 21. Voluntary Organisation (Abbreviation). 22. Number of outer electrons which gives extreme unreactivity to noble gases. 23. The number of electrons in the outer orbit of halogens. 25. See 5 down. 26. and 6 across. Group of unreactive non-metals.

Down: 2. and 7 across. Group 1. 3. Period of a year. 4. Subatomic particle with no electrical charge. 5. Scrambled edible apricot. 6. See 26 down. 8. _______________ structure; the way electrons are arranged in orbits. 12. Symbol for nickel. 13. A term used to indicate a group 7 element. 15. That's obliging of citizens. 16. Symbol for Radium. 17. Subatomic particle with a positive electrical charge. 18. Category of chemical symbol indicating solid, liquid, gas or solution. 22. Fall (of tide). 24. Adult elver.