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%
65
flagthe United Arab Emirates
1%
6%
85%
6%
61
flagSwitzerland
8%
6%
81%
4%
74
flagItaly
1%
5%
79%
13%
86
flagthe Netherlands
7%
10%
73%
9%
130
flagthe United Kingdom
5%
15%
63%
15%
650
flagAustria
9%
15%
60%
15%
33
flagIndia
8%
21%
58%
10%
329
flagGermany
8%
17%
58%
15%
307
flagPoland
6%
18%
56%
19%
18795
flagPakistan
5%
22%
56%
15%
53
flagthe United States
8%
20%
55%
14%
573
flagNorway
4%
26%
54%
14%
42
flagFrance
12%
16%
50%
22%
50
flagAustralia
10%
20%
47%
20%
40
flagthe Philippines
12%
30%
45%
12%
33
flagRepublic of Ireland
9%
22%
42%
24%
61
flagUnknown
8%
22%
38%
30%
1468
flagCanada
6%
24%
37%
31%
45
flagSweden
15%
29%
31%
23%
51

Gender

men54%
women60%
Protium
6%
6%
Deuterium
17%
16%
Tritium
54%
60%
None
22%
16%

Language versions

question
answers
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Which of the hydrogen isotopes is radioactive?
1560
52%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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