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

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Arithmetic. an algebraic process that may be shut less than an group associative Procedure, as multiplication or addition, and in which there is an identity element that, on operating on An additional component, leaves the second element unchanged, and by which Every element has corresponding to it a unique element that, on functioning on the main, brings about the id aspect.