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%
88%
1%
63
flagItaly
0%
6%
85%
7%
76
flagVietnam
5%
5%
85%
5%
20
flagthe United Arab Emirates
2%
8%
81%
8%
48
flagGermany
3%
15%
64%
16%
217
flagthe United Kingdom
5%
15%
63%
15%
514
flagthe United States
7%
18%
60%
13%
434
flagthe Netherlands
10%
15%
60%
13%
65
flagPakistan
2%
17%
58%
20%
34
flagPoland
6%
18%
56%
19%
12031
flagIndia
7%
23%
56%
11%
225
flagNorway
6%
24%
55%
13%
29
flagthe Philippines
13%
22%
54%
9%
22
flagFrance
9%
17%
51%
21%
41
flagAustralia
7%
19%
50%
19%
26
flagRepublic of Ireland
4%
16%
47%
30%
42
flagMalaysia
4%
28%
47%
19%
21
flagSpain
17%
26%
43%
13%
23
flagUnknown
8%
25%
36%
28%
560
flagCanada
5%
28%
35%
30%
39

Gender

men57%
women57%
Protium
5%
6%
Deuterium
16%
17%
Tritium
57%
57%
None
19%
17%

Language versions

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Which of the hydrogen isotopes is radioactive?
1138
53%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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