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
flagItaly
0%
6%
87%
6%
64
flagFinland
0%
11%
86%
1%
52
flagVietnam
5%
5%
85%
5%
20
flagthe United Arab Emirates
2%
9%
78%
9%
41
flagGermany
4%
13%
68%
13%
193
flagPakistan
4%
12%
64%
20%
25
flagthe United States
7%
17%
61%
13%
400
flagthe United Kingdom
4%
17%
61%
16%
399
flagPoland
5%
18%
57%
17%
9413
flagthe Philippines
14%
19%
57%
9%
21
flagIndia
7%
23%
55%
11%
204
flagNorway
7%
26%
53%
11%
26
flagFrance
10%
15%
50%
23%
38
flagAustralia
7%
19%
50%
19%
26
flagMalaysia
4%
28%
47%
19%
21
flagUnknown
14%
22%
46%
16%
121
flagSpain
22%
16%
44%
16%
18
flagthe Netherlands
17%
24%
43%
14%
41
flagRepublic of Ireland
6%
17%
41%
34%
29
flagCanada
5%
29%
35%
29%
37

Gender

men64%
women57%
Protium
5%
7%
Deuterium
15%
18%
Tritium
64%
57%
None
14%
16%

Language versions

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answers
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Which of the hydrogen isotopes is radioactive?
1023
54%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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