Across
- 2. An element found in the 3rd period and can form macromolecules with high melting point
- 7. a gray-black solid that sublimes to produce a purple vapor
- 9. A radioactive noble gas
- 10. A noble gas used in weather balloons
- 11. The most reactive alkali metal
- 12. A transition metal used in filaments of electric light bulbs and has the highest melting point
Down
- 1. An element with the symbol Ag
- 3. A halogen, reddish-brown liquid
- 4. A metal that burns with a yellow flame, is soft, and can float on water
- 5. A transition metal used as a catalyst in making margarine
- 6. An element that exists naturally as a diatomic molecule and is the lightest gas
- 8. A metal, liquid at room temperature