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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Platinum
Ruthenium
Silver
Lanthanum
answers
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24
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14
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