{^f Coinage metals: authors differ on no matter whether roentgenium (Rg) is taken into account a coinage steel. It can be in group eleven, like the opposite coinage metals, and is predicted being 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 there is an identity element that, on operating on An additional component, leaves the second element unchanged, and by which Every component has equivalent to it a unique element that, on operating on the first, results in the id group ingredient.