{^f Coinage metals: authors vary on whether roentgenium (Rg) is considered a coinage steel. It can be in group eleven, like the other coinage metals, and is expected to get chemically comparable to gold.

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Mathematics. an algebraic technique that is definitely shut underneath an associative Procedure, as multiplication or addition, and wherein You can find an id element that, on operating on another element, leaves the second element unchanged, and in which Every element has corresponding to it a unique element that, on functioning on the main, brings about the id aspect.