Patterns in Properties of elements and compounds crossword puzzle @ doc brown's chemistry

FOR PRINTING OUT ONLY
 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                        42    43   44    45   
                    46          
47       48            49               
                         50     
 51    52     53      54   55     56          57        
             58                 
  59         60           61            
 62     63               64         65   66     
         67    68     69                
      70                        
             71     72      73     74       
   75     76      77   78         79   80           
 81   82                   83           
       84       85         86       87      
    88                          
   89           90         91           

Across:

5. Cannot be broken down into simpler substances (7)
9. An insoluble solid is formed from mixing solutions. (13)
13. One of the colours you see in the flame test for copper. (5)
14. The chemical symbol for the least dense ('lightest') of the Noble Gases (2)
15. A summary of all the atoms in a molecule or compound (7)
16. Chemical Symbol for a orange-reddish Transition Metal. (2)
17. The type of chemical change that absorbs energy in the process. (11)
19. Great in balloons! (6)
20. A particle made up of two atoms! (8,8)
26. Its atomic number is 47. (6)
30. What you get if you dissolve something in a solvent. (7)
32. The kind of chemistry that tells you what is in a compound or mixture. (10)
35. The colour of the precipitate formed when sodium hydroxide solution is added to iron(II) sulphate solution (5)
36. Water, carbon dioxide, oxygen and nitrogen are examples of (9).
40. A complete horizontal row of elements in that well known table! (6)
41. The number of protons in the nucleus of an atom (6,6)
43. The formula of sodium hydroxide. (4)
46. It has the symbol Fe and a very useful Transition Metal. (4)
47. Always in Group 1 of the Periodic Table! (6,5)
49. One of the particles in the nucleus of an atom. (6)
50. The number of the group of the most reactive metals in the periodic table. (3)
51. If its a (5,3) it ain't very reactive!
54. Reactive non-metals and quite coloured. (8)
57. Not very reactive but lights up your life! (4)
58. Reacts violently with water forming an alkali. (2)
60. The formula of the compound when sodium reacts with water. (4)
62. The result of chemically combining two or more elements to form a new substance. (8)
64. The state of iodine at room temperature and pressure. (5)
65. The symbol of a metal used in batteries. (2)
68. Used to denote an element. (6)
70. The group number of F, Cl, Br, I and At. (5)
71. Iodine readily forms this coloured vapour on gentle heating. (6)
75. The colour of solid iodine. (5)
77. The colour of the precipitate when sodium hydroxide is added to zinc chloride solution. (5)
79. Chlorine is a very (8) non-metal.
81. A rapid reaction of a fuel and oxygen. (4)
83. The chemical symbol for the last halogen! (2)
84. The colour from sodium atoms in a flame test. (6)
86. The reactivity of the Group 7 Halogens (7) down the group.
89. The charge on an electron. (5)
90. The formula for the main compound in 'common salt. (4)
91. This happens to the reactivity of the Group 1 Alkali Metals as you up the group with decrease in atomic number. (9)

Down:

1. A row of very useful elements on Period 4 with many structural applications. (10,5)
2. The least reactive Alkali Metal. (2)
3. If chlorine is breathed in it can cause (4) to the lungs.
4. Formula of the compound formed when potassium reacts with water. (3)
6. This type of reaction gives out heat energy. (10)
7. The charge on a neutron! (4)
8. With increase in atomic number the reactivity of the Alkali Metals (9)
10. The black compound formed when copper is heated in air. (3)
11. The last part of the names of salts formed from the Group 7 elements. (3)
12. Not very reactive but can light up your life! (2)
18. Formed by nuclear fusion of hydrogen in the Sun but not very reactive!
21. Essential for respiration! (2)
22. Symbol of the element that will displace bromine and iodine from their salts. (2)
23. Symbol for hydroxide in a chemical formula. (2)
24. Symbol of a metal that is used in electrical wiring
25. The colour of the precipitate when sodium hydroxide is added to iron(III) chloride solution. (5)
27. Top of Group 1. (2)
28. Its easy to (3) sodium.
29. The chemical symbol of a very reactive element with water but quite harmless in common salt. (2)
31. This molecule can't displace the top 3 Halogens! (2)
33. Has the lowest atomic number in Group 2. (2)
34. A hot way of identifying certain metals in their compounds. (5,4)
37. The negative particle that orbits the nucleus of an atom.
38. There is no charge for adding this to a nucleus! (7)
39. What chlorine can do to you! (4)
42. An element used to disinfect the skin in operations. (6)
44. A very unreactive gas used in light bulbs and lasers. (5)
45. Formula of the gaseous molecule formed when potassium reacts with water. (2)
46. Very adequately describes the chemical character of the Noble Gases! (5)
48. The last three letters of the Group 7 elements.
52. Readily gives a brown vapour when the bottle is opened in the fume cupboard. (2)
53. Vertical columns of similar elements in the Periodic Table.
55. The basic building blocks of all substances and come in 92 naturally varieties. (5)
56. The state of chlorine and fluorine at room temperature. (3)
59. Shiny yellow treasure! (4)
61. Metal used to make an excellent conducting base for more expensive cooking pans. (6)
63. The flame colour for potassium, a bit like lilac too. (6)
66. The centre of an atom and electrons orbit around it. (7)
67. Symbol of Transition Metal that rusts too easily! (2)
69. The colour of the precipitate formed when sodium hydroxide solution is added to copper sulphate solution. (4)
71. Symbol of a rare metal which is in the 3rd series of Transition Metals and used to make expensive silvery jewellery but isn't silver! (2)
72. The electrical charge on a proton. (4)
73. The (4) of a reaction is its speed. (4)
74. Not really a transition metal, at the end of the series and doesn't form coloured compounds usually, but its handy in batteries and brass! (4)
75. More reactive than I and not as reactive as Cl. (2)
76. Symbol of the element which is good at killing bacteria in swimming pools.
78. Formula of water. (3)
80. I hope this organ is working well when your chemistry teacher is explaining things! (3)
82. Formula of a dark coloured molecule. (2)
84. Alkali Metals get more reactive with increase in atomic number? (3)
85. Tungsten, oxygen and nitrogen sum up what you would like from the lottery. (3)
87. A period of time, the 19th century was a great one for the development of the Periodic Table. (3)
88. Formula of potassium iodide. (2)