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
flagGhana
0%
0%
90%
0%
10
flagBelarus
0%
0%
83%
8%
12
flagIndia
2%
9%
77%
8%
225
flagPakistan
0%
12%
76%
12%
25
flagthe Netherlands
0%
11%
76%
11%
17
flagCanada
0%
10%
70%
20%
10
flagBelgium
10%
10%
70%
10%
10
flagNigeria
5%
19%
66%
8%
36
flagthe Philippines
11%
22%
66%
0%
18
flagPoland
7%
11%
65%
15%
4162
flagRussia
13%
8%
63%
13%
36
flagAustralia
18%
10%
60%
10%
38
flagAustria
16%
4%
60%
20%
25
flagthe United Kingdom
8%
18%
57%
15%
59
flagRepublic of Ireland
6%
20%
53%
20%
15
flagGermany
8%
16%
51%
23%
117
flagthe United States
9%
16%
50%
23%
134
flagGreece
26%
10%
47%
15%
19
flagUkraine
13%
13%
40%
27%
22
flagSpain
0%
7%
30%
53%
13