sblock Elements 1 Question 18
14. The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are
(2019 Main, 10 Jan I)
(a) 2 and 1
(b) 3 and 2
(c) 2 and 0
(d) 3 and 1
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Answer:
Correct Answer: 14. (d)
Solution:
- Hydrogen has three isotopes:
| Protium (P) | Deuterium (D) | Tritium (T) | |
| 1 | 1 | 1 | |
| 0 | 1 | 2 | |
| 0 | 1 | 2 |
Only tritium (T) is radioactive, because of its very high
