Which of the hydrogen isotopes is radioactive?

Protium
Deuterium
Tritium
None
The two lightest isotopes of hydrogen are stable (protium and deuterium). The tritium is radioactive and unstable, with a half-life of 12.32 years. It is the only radioactive isotope of hydrogen which naturally occurs on Earth (although it is extremely rare).
Paweł Kołodziejczyk
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Very interesting!
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Answers by country

Protium
Deuterium
Tritium
None
answers
flagthe Netherlands
12%
12%
54%
20%
24
flagGhana
4%
32%
52%
12%
25
flagthe United Arab Emirates
13%
17%
52%
17%
23
flagIndia
9%
28%
50%
9%
911
flagthe United Kingdom
8%
24%
49%
15%
309
flagthe United States
9%
23%
47%
18%
604
flagPakistan
8%
23%
46%
21%
103
flagAustralia
12%
22%
46%
18%
100
flagRepublic of Ireland
15%
26%
46%
11%
26
flagCanada
3%
25%
45%
25%
62
flagFrance
0%
20%
45%
33%
24
flagNigeria
23%
15%
44%
16%
97
flagPoland
7%
23%
42%
25%
17206
flagNew Zealand
31%
18%
40%
9%
22
flagSingapore
17%
17%
38%
26%
34
flagGreece
4%
39%
34%
21%
23
flagthe Philippines
14%
33%
33%
18%
77
flagMalaysia
6%
33%
33%
26%
45
flagGermany
10%
25%
32%
31%
70
flagIndonesia
15%
26%
31%
26%
19