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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
flagEstonia
0%
6%
93%
0%
16
flagItaly
0%
2%
92%
4%
41
flagGhana
5%
0%
88%
0%
17
flagIndia
2%
10%
77%
9%
238
flagPakistan
0%
11%
77%
11%
27
flagBelarus
6%
0%
75%
12%
16
flagthe Netherlands
10%
10%
70%
10%
20
flagthe Philippines
10%
21%
68%
0%
19
flagNigeria
6%
18%
67%
8%
49
flagPoland
7%
11%
65%
15%
4449
flagRussia
9%
13%
64%
11%
51
flagAustralia
16%
9%
61%
11%
42
flagKazakhstan
20%
13%
60%
6%
15
flagthe United Kingdom
7%
18%
59%
14%
69
flagAustria
15%
12%
56%
15%
32
flagGermany
7%
16%
53%
20%
154
flagthe United States
8%
15%
52%
23%
147
flagGreece
26%
10%
47%
15%
19
flagUkraine
14%
14%
44%
22%
27
flagSpain
5%
5%
27%
55%
18

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