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%
9%
86%
4%
43
flagBulgaria
0%
0%
84%
15%
13
flagFinland
0%
15%
82%
2%
40
flagDenmark
0%
15%
76%
7%
13
flagthe United Arab Emirates
0%
8%
66%
25%
12
flagGermany
5%
12%
61%
20%
108
flagPakistan
5%
15%
60%
20%
20
flagthe United States
7%
18%
59%
14%
296
flagthe United Kingdom
5%
16%
58%
19%
255
flagIndia
7%
22%
56%
9%
151
flagNorway
8%
21%
56%
13%
23
flagPoland
6%
19%
55%
18%
6520
flagthe Philippines
11%
22%
55%
11%
18
flagMalaysia
5%
25%
50%
20%
20
flagSpain
8%
25%
50%
16%
12
flagAustralia
8%
20%
48%
20%
25
flagCanada
6%
23%
40%
30%
30
flagFrance
21%
21%
31%
26%
19
flagthe Netherlands
12%
37%
31%
18%
16
flagRepublic of Ireland
5%
16%
27%
50%
18

Gender

men63%
women55%
Protium
5%
7%
Deuterium
14%
19%
Tritium
63%
55%
None
15%
17%

Language versions

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answers
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Which of the hydrogen isotopes is radioactive?
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53%

Details

Author: Paweł Kołodziejczyk
Illustration: Elliott Brown
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