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Message:: [QUOTE="900fine, post: 449174, member: 6036"]Yes, it's true... the ultimate goal is to make the coin the right weight. But think of it like this : Since a counterfeiter will have no problem making a coin of the right dimensions, the fake will also match a real one in volume. That being so, the way to be close in weight is to use an alloy close in density to the silver alloy used for authentic coins. A periodic table will be of no help unless it shows the element's density. I personally have never seen that, but perhaps they do exist (only for the solids and liquids, of course). Neither the atomic number nor the atomic mass are of any interest. When you say "close to silver in weight", what you really mean is close to silver in density. That information is typically not on a periodic table and cannot be inferred from the info that is there. There are several sources for density of metals. I have a Perry's Chemical Engineer's Handbook around here somewhere... I bet they might have something.[/QUOTE]