Which of these elements is not a precious metal?

Platinum
Ruthenium
Silver
Lanthanum
Lanthanum is a chemical element with symbol La . It is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Lanthanum does not belong to precious metals.
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Answers by country

Platinum
Ruthenium
Silver
Lanthanum
answers
flagMalaysia
5%
11%
11%
66%
18
flagGermany
0%
32%
2%
64%
37
flagUnknown
0%
24%
12%
64%
25
flagGreece
0%
33%
8%
58%
12
flagthe Philippines
3%
27%
12%
57%
33
flagPoland
5%
32%
7%
54%
3850
flagIndia
6%
30%
9%
53%
388
flagAustralia
7%
35%
2%
52%
42
flagthe United Kingdom
2%
34%
10%
51%
79
flagthe United States
7%
35%
10%
47%
219
flagCanada
5%
35%
11%
47%
17
flagPakistan
6%
33%
18%
42%
33
flagNigeria
15%
46%
15%
23%
26