how much francium remain in 500gm of sample after 63 min
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364 ggvdydbdhydctdhhxhjxdyhdhdjfgt bfhcbfjfbydnrinejdnfyjunufnixnrudnoheudjuxjdifgfgbdijdjdjddhyfndhdndjyhrufrgbuyhbyfndhgffgnjxnxud
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