2805Level 3

Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed; mercury

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280511Alkali or alkali-earth metals; sodium

280512Alkali or alkali-earth metals; calcium

280519Alkali or alkali-earth metals; other than sodium and calcium

280530Earth-metals, rare; scandium and yttrium, whether or not intermixed or interalloyed

280540Mercury

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