| http://www.w3.org/ns/prov#value | - They begin with number 57 Lanthanum and end with 71 Lutetium, a group of metallic chemical elements that are not rare as much as they are just difficult to mine because they occur in tiny amounts and are often stuck to each other.Unlike metals higher up on the table such as silver and gold, there is no good agent for dissolving elements so closely linked in atomic structure without destroying the t
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