Across
- 5. Special features are catenation, Tetravalency, Multiple bonds, Isomerism, Allotropy
- 7. Has the lowest density of any metal, burns with a bright red color.
- 9. 78% of atmosphere, Non inflammable
- 11. Univalent poisonous gaseous halogen, pale yellow-green, most chemically reactive & electronegative of all the elements.
- 14. Alkaline metal, good conductor of heat and electricity, burns with lavender colour flame.
- 15. Silvery-white metal. It is relatively soft and has a low density. Used in alloys with Cu or Ni to make gyroscope
- 17. Atomic number of 11, Less density than water, produce Hydrogen with water, burns with golden yellow flame
- 18. Halogen member, greenish yellow gas
- 19. Colorless and odorless, lighter than air, and its solubility in water is very low. does not have any neutrons in its nucleus.
Down
- 1. Lowest boiling point, used for filling balloons.
- 2. Light weight silver metal main group of 13,used to build cars and aero plane parts
- 3. Semiconductor used in computer chips
- 4. Noble gas, used to protect the weld area and in incandescent light bulbs to stop oxygen from corroding the filament
- 6. Highly reactive and form oxides with almost all elements except noble gases, three forms- monoatomic, diatomic & triatomic.
- 8. Silvery metal, when cuts turns to black, used for sparkplug electrodes and in vacuum tubes as drying and oxygen-removing agent.
- 10. Used in salt, atomic number of 53, member of halogen
- 12. Reddish orange, noble gas used in television sets and lasers
- 13. Atomic number of 20, important for bone health.
- 16. Burns with bright light, Alkaline metal
- 17. Pale yellow non metal used in car batteries and fertilizers