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Across 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

Down 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