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Message: <blockquote data-quote="Majere" data-source="post: 1411634" data-attributes="member: 13916">Hmmm1) Its a game.. its YOUR game, make it up2) GAH NONONO STOP IT too much pidgeon science- Dont say things like "iron weighs more than lead" It all depends on how much you have, If I have a piece of lead with a mass of a tonne, and iron with a mass of 1 gramme then the lead weighs more than the iron in the same gravitational field. If I take the piece of iron to a neutorn star and leave the lead on earth then the iron weighs more than the lead. (which is a much more interesting state of affairs)What you are talking about is the DENSITY, i.e. comparing the MASSESS of items of the same size made of different materials. The densit metals are invariabley transition metals due to a good packing density, low atomic radius and higer atmoics weights. Cesium has a very low denstiy.. it will almost float on water dues to a primative cubic packing in the ions (Its BCC if I remeber last terms class). -Radioactivity has nothing to do with atomic numder directly. There are radioactive isotopes of hydrogen (atomic number 1). Its to do with the balance of nucelons and binding energies. There appear to be patterns of stability and it is hypothesised that nucelons may exist in semistable shells not unlike electrons which leads to hopes of producing "stable" nuclei of superheavy atoms. Almost all elements have radioactive isotopes, however the more radiative ones, by virtue of emiiting more radiation, dont last as long. The majority of long halflife radioisotopes are gamma-emmiters. -alpha and beta radiation is mostly harmless unless you inhale the radioisotope, they are too strongly ionising to penetrate more than a few centimeteres of air. -I doubt we would die without exposure to radiation.. we may however stop evolving which is a much more interesting thought. I dont know of any life form that in anyway harnessess radiation in a biological process.. but It would be amazing if there were such a creature. 3) Yes I know I sound like a nerd and a loser, it comes with being a chemistry undergrad. Would be very interested to hear more about the biological effects of hyperexposure. MajereShoots all the pidgeons.</blockquote>

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