Periodic Table

3. Element associated with "Brimstone" and rotten egg smell
5. Common name for silicon dioxide
8. Fluorine is one of 5 of this type of element found in Group 7 (or 17) of the periodic table
11. This element reacts with chlorine to produce table salt
12. Plants do not grown unless there are traces of this metalloid in the soil
13. A noble gas with atomic number 18
15. Halogen best known for its role as a disinfectant
18. Earth metal with atomic number 4 capable of reflecting neutrons
19. A noble gas that makes up about 24 per cent of the sun's mass
20. A soft silvery metal with the lowest density of any metal
21. This gas makes up 78% of the earth's atmosphere

1. Common name for H2O
2. Known as "the Devil's element" due to it being the 13th element to be discovered
4. This alkaline earth metal burns extremely brightly when ignited in air
6. A colourless non-metal that makes up more than 75% of the detectable universe
7. Dimitri ......... (1834-1907)Russian scientist and creator of the first version of the periodic table
9. A disease common in post-menopausal women due in part to lower levels of calcium in the body which is vital to bone renewal
10. An alkali metal with the chemical symbol K (for Kalium)
14. A carbon allotrope (the other 2 naturally occurring allotropes being diamonds and anthracite)
16. Colour given off when electricity is passed through a closed glass tube containing neon gas
17. A light metal with many uses and found in cans, foil and cars amongst other things