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  • (a) In this crossword puzzle (Fig 3.2), names of 11 elements are hidden. Symbols of these are given below. Complete the puzzle.

(a) In this crossword puzzle (Fig 3.2), names of 11 elements are hidden. Symbols of these are given below. Complete the puzzle.
1. Cl        7. He
2. H         8. F
3. Ar        9. Kr
4. O        10. Rn
5. Xe       11. Ne
6. N

(b) Identify the total number of inert gases, their names and symbols from this cross word puzzle.

Answers (1)

Answer:

(a) 

(b) Six inert gases:
Helium (He); Neon ( Ne); Argon (Ar); Krypton (Kr); Xenon (Xe); Radon (Rn).

 

Noble gases are a group of chemical elements that are known for their lack of reactivity and stability: 

  • Group: Noble gases are in group 18 of the periodic table. 
  • Properties: Noble gases are colorless, odorless, and tasteless. They are also nonflammable and have very low chemical reactivity. 
  • Elements: The noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). 
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