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%
11%
86%
1%
51
flagItaly
0%
7%
84%
7%
53
flagthe United Arab Emirates
5%
10%
68%
15%
19
flagDenmark
6%
18%
68%
6%
16
flagGermany
3%
14%
67%
15%
171
flagPakistan
4%
13%
60%
21%
23
flagthe Philippines
10%
20%
60%
10%
20
flagthe United States
8%
17%
59%
13%
339
flagthe United Kingdom
5%
17%
59%
17%
331
flagPoland
6%
18%
56%
18%
7977
flagIndia
7%
23%
56%
9%
180
flagNorway
7%
26%
53%
11%
26
flagMalaysia
5%
25%
50%
20%
20
flagFrance
11%
17%
48%
22%
35
flagAustralia
8%
20%
48%
20%
25
flagUnknown
11%
19%
47%
20%
67
flagSpain
23%
17%
47%
11%
17
flagCanada
6%
27%
36%
30%
33
flagthe Netherlands
22%
29%
35%
12%
31
flagRepublic of Ireland
8%
13%
34%
43%
23

Gender

men63%
women56%
Protium
5%
7%
Deuterium
15%
19%
Tritium
63%
56%
None
15%
17%

Language versions

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answers
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Which of the hydrogen isotopes is radioactive?
879
53%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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