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
flagBelarus
0%
0%
81%
9%
11
flagthe Netherlands
0%
7%
76%
15%
13
flagIndia
2%
11%
75%
8%
181
flagPakistan
0%
18%
75%
6%
16
flagthe Philippines
0%
28%
71%
0%
14
flagAustria
6%
6%
66%
20%
15
flagRepublic of Ireland
0%
16%
66%
16%
12
flagNigeria
0%
16%
66%
16%
12
flagPoland
7%
11%
64%
16%
3799
flagAustralia
15%
9%
62%
12%
32
flagRussia
15%
11%
57%
15%
26
flagthe United States
11%
17%
51%
21%
100
flagthe United Kingdom
12%
18%
51%
18%
33
flagGermany
5%
17%
48%
28%
76
flagGreece
26%
10%
47%
15%
19
flagUkraine
14%
9%
42%
28%
21