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
flagPakistan
0%
16%
75%
8%
12
flagIndia
2%
13%
72%
9%
146
flagAustralia
3%
10%
71%
14%
28
flagRussia
10%
10%
68%
10%
19
flagthe Philippines
0%
33%
66%
0%
12
flagPoland
7%
11%
64%
16%
3527
flagRepublic of Ireland
0%
18%
63%
18%
11
flagAustria
8%
8%
58%
25%
12
flagthe United States
9%
16%
52%
21%
92
flagthe United Kingdom
11%
14%
51%
22%
27
flagGreece
14%
14%
50%
21%
14
flagGermany
1%
21%
48%
28%
52
flagUkraine
11%
5%
47%
29%
17