Which naturally occurring chemical element is the densest?

helium
lead
osmium
platinum
The density of osmium is 22,570 kg/m3, slightly more than Iridium (22,420) and platinum (21,450). Commonly used metals are considerably less dense - the density of iron is 7,870, lead 11,340 and mercury 13,456.
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Answers by country

helium
lead
osmium
platinum
answers
flagGreece
15%
7%
61%
15%
13
flagGhana
7%
21%
57%
14%
14
flagAustria
8%
8%
56%
28%
25
flagthe Netherlands
0%
18%
54%
18%
11
flagIndia
7%
17%
53%
20%
529
flagMalaysia
14%
10%
53%
21%
28
flagSingapore
4%
18%
50%
27%
22
flagRepublic of Ireland
0%
40%
50%
10%
10
flagAustralia
6%
30%
48%
16%
50
flagPoland
4%
31%
42%
21%
9795
flagthe United States
5%
28%
40%
24%
469
flagCanada
7%
25%
39%
25%
28
flagSwitzerland
5%
33%
38%
22%
18
flagthe United Kingdom
5%
33%
36%
23%
184
flagNigeria
22%
29%
33%
11%
27
flagGermany
2%
36%
32%
28%
102
flagPakistan
10%
23%
31%
32%
64
flagthe United Arab Emirates
0%
23%
30%
46%
13
flagthe Philippines
10%
29%
27%
27%
58
flagIndonesia
10%
20%
20%
50%
10