Density is determined by more than atomic weight. The atom-to-atom spacing also matters. Iridium and Osmium both have higher bulk densities than Bismuth (about 22.6 g/cc for Iridium, 22.5 g/cc for Osmium, versus 9.80 g/cc for Bismuth) because their atoms are more tightly packed.
but im saying given enough presure (just below that required to cause fusion) you could get the atoms them selfs to move closer and thus causing increesed density.
That's really completely irrelevant. At standard pressure and temperature, there are many elements more dense than bismuth. You could compress bismuth to be more dense than osmium is at standard pressure, but if you compressed osmium with the same pressure, it would be denser than bismuth. And the moment you released the pressure, they'd both go back to their normal density.
and i never said that bismith was the most dense i said it was the heaviest.
Actually, you said that a 1cmx1cmx1cm cube of bismuth would be heavier than one of silver or any other element, which is incorrect. You then went back and edited your post to mention atom count after it was pointed out that you were wrong. Of course, a 1cmx1cmx1cm cube of bismuth will contain far fewer atoms than a 1cmx1cmx1cm cube of silver, which is why silver has a higher density than bismuth despite bismuth having a higher atomic mass.
i siad 1x1x1 cube made of the same number of atoms.
Not in your original post, you didn't. You went back and edited it once your error was pointed out. And it's a moot point since under equivalent circumstances a same size cube won't have the same number of atoms, and under the same circumstances other elements will always be more dense than bismuth. It's also irrelevant to the discussion anyway. Bismuth, lead, and silver can all be smelted by dwarves, unlike iridium or osmium. And silver and lead, at normal pressures and temperatures, will always be more dense than bismuth.
And what does a bose-einstein condensate have to do with it? Were you planning to make the bismuth into a diffuse gas and then cool it to just above absolute zero? It won't form a bose-einstein condensate anyway, since bismuth atoms have an odd number of fermions, and therefore isn't a boson and can't form a bose-einstein condensate.