Which letter is not used as a symbol of chemical element?

H
I
J
K
H is the chemical symbol of hy­dro­gen, I - iodine, K - potas­si­um.

Answers distribution

H
I
J
K
answers
flagPakistan
0%
5%
94%
0%
19
flagthe Philippines
0%
7%
92%
0%
14
flagIndia
5%
4%
89%
0%
88
flagCanada
0%
0%
87%
6%
16
flagthe United States
5%
5%
81%
5%
190
flagthe United Kingdom
3%
9%
78%
6%
116
flagUnknown
4%
12%
78%
4%
41
flagNorway
16%
8%
75%
0%
12
flagPoland
8%
13%
72%
4%
2651
flagAustralia
8%
0%
66%
8%
12
flagGermany
13%
16%
46%
23%
43

Gender

men74%
women71%
H
8%
10%
I
13%
12%
J
74%
71%
K
3%
5%

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Which letter is not used as a symbol of chemical element?
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