Which of these metals is a precious metal?

Calcium
Iron
Silver
Tantalum
A precious metal is a rare, naturally occurring metallic chemical element of high economic value. They are usually ductile and have a high lustre. Historically, precious metals were important as currency, but are now regarded mainly as investment and industrial commodities. Gold, silver, platinum, and palladium each have an ISO 4217 currency code.
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Answers by country

Calcium
Iron
Silver
Tantalum
answers
flagSwitzerland
0%
0%
90%
10%
20
flagthe Netherlands
0%
0%
88%
11%
17
flagSouth Africa
7%
0%
84%
0%
13
flagthe United Arab Emirates
6%
0%
80%
6%
15
flagGermany
4%
8%
78%
7%
361
flagPoland
3%
4%
76%
15%
4431
flagAustralia
1%
1%
76%
20%
68
flagGhana
3%
7%
76%
7%
26
flagAustria
0%
3%
75%
18%
53
flagGreece
5%
5%
75%
15%
20
flagthe United Kingdom
1%
1%
73%
21%
157
flagNigeria
4%
6%
73%
14%
110
flagSingapore
0%
7%
71%
21%
14
flagthe United States
2%
7%
70%
16%
311
flagthe Philippines
4%
16%
67%
11%
43
flagCanada
0%
3%
62%
34%
29
flagIndia
2%
4%
57%
34%
636
flagMalaysia
4%
4%
56%
36%
25
flagPakistan
1%
10%
41%
45%
70
flagSaudi Arabia
0%
16%
33%
50%
12