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).
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Answers by country
Protium
Deuterium
Tritium
None
answers
the Netherlands
24
Ghana
25
the United Arab Emirates
23
India
911
the United Kingdom
309
the United States
604
Pakistan
103
Australia
100
Republic of Ireland
26
Canada
62
France
24
Nigeria
97
Poland
17206
New Zealand
22
Singapore
34
Greece
23
the Philippines
77
Malaysia
45
Germany
70
Indonesia
19