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Across 4. Chemical element with the symbol Yb 5. Canis lupus 9. The most famous theoretical physicist in the UK 12. Plants make oxygen by this process 13. The inventor of the bouncing bomb 15. Female X-ray crystallographer who worked out DNA 16. Mendeleev is credited with inventing this chemistry icon 17. Combustion of hydrogen in ______ makes water 18. The process of solid becoming a gas

Down 1. A metal and a planet 2. C60 football 3. Astrology is to astronomy as _______ is to pharmacy 6. Nurse in the Crimean War, memorialised outside St Thomas' Hospital 7. The mathematics of snowflakes 8. Isolated graphene using sticky tape 10. Dry ice is made of this 11. E=mc^2, c =? 14. Water has the highest density at this temperature (Celsius)