{^f Coinage metals: authors differ on no matter if roentgenium (Rg) is considered a coinage metal. It really is in group eleven, like one other coinage metals, and is expected to get chemically similar to gold.
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Mathematics. an algebraic API서비스 system that's closed below an associative operation, as multiplication or addition, and during which There is certainly an identification factor that, on running on another element, leaves the 2nd component unchanged, and during which Each and every component has equivalent to it a unique component that, on operating on the first, results in the id ingredient.