Which of the following non-metals is liquid at room temperature? 

SOLVE THE PUZZLE

CLUES

Across:
4. Another word for type of shininess.
7. Mixture of two or more different metals.
8. This metal is not malleable.
12. Property which allows material to bend when hit with a hammer.
14. Luster that is shown by a piece of wood or graphite.
16. Glass and wood are examples.
17. Material reacts with oxygen in the atmosphere.
18. Luster that is shown by glass.


Down : 
1. This property is least useful in telling if something is a metal. 
2. Copper, Zinc and Tin are examples of this. 
3. Luster that is shown by a candle. 
5. Lead may be said to have this luster. 
6. This non-metal, a form of Carbon, conducts electricity. 
9. This precious metal does not oxidise. 
10. These are free to move in metals but are held in place in non-metals. 
11. Zinc has this luster. 
13. This non-metal, a precious form of Carbon, does not conduct electricity. 
15. This metal forms the outside of pennies.

Which of the following metals does not displace ${\mathrm{H}}_2$ gas from dilute $\mathrm{HCl}$ or dilute ${\mathrm{H}}_2{\mathrm{SO}}_4$?

Which of the following metals is extracted only by electrolysis?