Which of the following is not a hydrogen isotope?

tritium
protium
iridium
deuterium
Protium, deuterium and tritium are hydrogen isotope varieties. Iridium is a chemical element.
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Answers by country

tritium
protium
iridium
deuterium
answers
flagIndia
2%
9%
76%
8%
112
flagAustralia
4%
12%
66%
16%
24
flagPoland
7%
11%
63%
16%
3358
flagthe United States
10%
15%
51%
22%
88
flagthe United Kingdom
12%
16%
50%
20%
24
flagGermany
2%
25%
37%
35%
40
flagUkraine
18%
0%
27%
45%
11