{^file Coinage metals: authors vary on regardless of whether roentgenium (Rg) is taken into account a coinage metallic. It's in group 11, like the opposite coinage metals, and is predicted to be chemically much like gold.

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Mathematics. an algebraic program that is certainly shut underneath an associative Procedure, as group multiplication or addition, and where You can find an id ingredient that, on functioning on another element, leaves the 2nd element unchanged, and in which each element has corresponding to it a unique ingredient that, on functioning on the main, brings about the id factor.