question_answer 71)

  (a) In this crossword puzzle (Figure), names of 11 elements are hidden. Symbols of these are given below. Complete the puzzle. 1. Cl                        2. H                 3. Ar              4. 0 5. Xe                      6. N                 7. He             8. F 9. Kr                       10. Rn             11. Ne                   (b) Identify  the total number of inert gases, their names and symbols from this cross ward puzzle.

Answer:

  (a) The names of these elements are given as follows 1.Cl- Chlorine                     7. He ? Helium 2. H-Hydrogen                   8. F- fluorine 3. Ar-Argon                         9. Kr- Krypton 4. O- Oxygen                      10. Rn- Radon 5. Xe- Xenon                      11. Ne-Neon 6. N-Nitrogen   (b) Total number of inert gases in this crossword puzzle is 6. Their names and symbols are as follows

S. No.	Name of gas	Symbol
1.	Helium	He
2.	Neon	Ne
3.	Argon	Ar
4.	Krypton	Kr
5.	Xenon	Xe
6.	Radon	Rn