20.
(i) give the names and symbols of three monoatomic gases, which are chemically inert.

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Solution

Dear Student,

The inert and monoatomic gases are,

He - Helium
Ar - Argon
Xe - Xenon

Total 5 are there and the other two are Krypton and Radon.

Regards.

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Question 46
(a) In this crossword puzzle (Fig 3.2), names of 11 elements are hidden Symbols of these are given below. Complete the puzzle

1. CI 7. He

2. H 8. F

3. Ar 9. Kr

4. O 10. Rn

5. Xe 11. Ne

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

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