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%
5%
87%
7%
70
flagFinland
0%
10%
87%
1%
57
flagVietnam
5%
5%
85%
5%
20
flagthe United Arab Emirates
2%
9%
78%
9%
41
flagGermany
3%
13%
66%
15%
203
flagthe United Kingdom
4%
15%
63%
16%
462
flagthe United States
7%
17%
61%
13%
411
flagPakistan
3%
16%
60%
20%
30
flagPoland
5%
18%
58%
17%
10118
flagIndia
7%
24%
55%
11%
216
flagthe Philippines
13%
22%
54%
9%
22
flagthe Netherlands
13%
19%
53%
13%
52
flagNorway
7%
26%
53%
11%
26
flagFrance
10%
17%
50%
22%
40
flagAustralia
7%
19%
50%
19%
26
flagSpain
20%
15%
50%
15%
20
flagRepublic of Ireland
6%
15%
48%
30%
33
flagMalaysia
4%
28%
47%
19%
21
flagUnknown
12%
24%
44%
18%
141
flagCanada
5%
29%
35%
29%
37

Gender

men64%
women58%
Protium
5%
6%
Deuterium
15%
18%
Tritium
64%
58%
None
14%
16%

Language versions

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answers
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Which of the hydrogen isotopes is radioactive?
1077
53%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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