Which of the hydrogen isotopes is radioactive?

Protium
Deuterium
Tritium
None
The two lightest isotopes of hydrogen are stable (protium and the heavy hydrogen (deu­teri­um)). The tritium is ra­dioac­tive and un­sta­ble, with half-life of 12.32 years. It is the only ra­dioca­tive isotope of hydrogen which nat­u­ral­ly occurs on Earth (although it is ex­treme­ly rare).

Answers distribution

Protium
Deuterium
Tritium
None
answers
flagFinland
0%
9%
89%
1%
64
flagthe United Arab Emirates
1%
7%
83%
7%
53
flagItaly
0%
6%
82%
11%
79
flagVietnam
4%
4%
77%
13%
22
flagthe Netherlands
9%
13%
65%
11%
84
flagthe United Kingdom
6%
15%
63%
14%
574
flagGermany
6%
16%
61%
16%
250
flagthe United States
7%
18%
59%
14%
460
flagNorway
5%
26%
57%
10%
38
flagPakistan
2%
18%
57%
21%
38
flagIndia
7%
22%
56%
11%
243
flagPoland
6%
18%
55%
19%
16001
flagAustralia
5%
14%
54%
22%
35
flagthe Philippines
16%
20%
54%
8%
24
flagFrance
11%
16%
48%
23%
43
flagRepublic of Ireland
5%
19%
47%
27%
51
flagMalaysia
4%
28%
47%
19%
21
flagSpain
13%
26%
43%
16%
30
flagUnknown
8%
22%
38%
31%
1325
flagCanada
5%
27%
37%
30%
40

Gender

men53%
women58%
Protium
6%
6%
Deuterium
17%
17%
Tritium
53%
58%
None
22%
17%

Language versions

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answers
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Which of the hydrogen isotopes is radioactive?
1229
53%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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