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%
84%
6%
58
flagSwitzerland
6%
2%
84%
6%
44
flagItaly
1%
5%
78%
14%
85
flagthe Netherlands
9%
11%
68%
10%
106
flagthe United Kingdom
5%
15%
63%
15%
614
flagGermany
6%
16%
61%
15%
280
flagthe United States
7%
18%
58%
14%
484
flagIndia
7%
21%
58%
10%
283
flagPoland
6%
18%
55%
19%
17157
flagNorway
5%
25%
55%
15%
40
flagPakistan
6%
22%
54%
16%
48
flagAustralia
5%
16%
52%
22%
36
flagFrance
13%
15%
47%
23%
46
flagRepublic of Ireland
7%
20%
46%
25%
54
flagthe Philippines
14%
32%
46%
7%
28
flagSpain
13%
26%
43%
16%
30
flagUnknown
8%
22%
38%
30%
1418
flagCanada
6%
25%
36%
31%
44
flagSweden
11%
23%
29%
35%
34

Gender

men54%
women59%
Protium
6%
6%
Deuterium
17%
17%
Tritium
54%
59%
None
22%
16%

Language versions

question
answers
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flag
Which of the hydrogen isotopes is radioactive?
1353
52%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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