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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
flagRepublic of Ireland
0%
23%
71%
4%
21
flagSwitzerland
2%
18%
59%
18%
37
flagAustralia
4%
23%
55%
15%
88
flagMalaysia
13%
13%
55%
16%
36
flagthe Netherlands
0%
22%
55%
16%
18
flagIndia
7%
16%
53%
21%
736
flagAustria
5%
20%
52%
21%
69
flagGhana
13%
10%
51%
24%
29
flagSingapore
6%
16%
50%
26%
30
flagBangladesh
6%
25%
50%
18%
16
flagGreece
9%
23%
47%
19%
21
flagPoland
4%
30%
44%
19%
11476
flagthe United States
4%
27%
42%
23%
597
flagGermany
2%
30%
40%
26%
435
flagCanada
6%
18%
40%
31%
44
flagthe United Kingdom
5%
36%
36%
21%
271
flagthe United Arab Emirates
0%
18%
36%
40%
22
flagthe Philippines
9%
29%
31%
25%
77
flagPakistan
13%
26%
30%
28%
83
flagNigeria
25%
30%
26%
16%
98

Does the candle burn more or less violently in zero gravity?

more violently
about the same
less violently
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What color is octopus blood?

red
blue
green
yellow

What is the main difference between Coca-Cola sold in the US, and the Coca-Cola sold in the EU?

sugar
water
caffeine
CO2 level

What is the densest substance in the universe?

osmium
diamond
core of the Sun
neutron star