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15 elements

15 elements of the periodic table

1 2
  3   4
5                 6  
7                 8    

5.Bauxite is its most important ore
7.Is found mainly in cinnabar ore and was used in thermometers
9.Makes up about 78% of atmosphere by volume
10.Diamond and grafite are two of its allotropic forms
11.Its 'Valley' is home to many of the world's largest technology corporations
12.Has been the basis of many currencies over the centuries
14.The first of noble gases
1.Is found commonly as NaCl
2.The most electronegative element, is found in toothpaste
3.The first of alcali metals
4.Key component of thyroid hormones
6.Has the highest melting point and lowest vapour pressure of all metals
8.Key component of haemoglobin
11.Its dioxide is one of the factors responsible for acid rain
13.Was used as an additive to gasoline

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