Chem 2 WS98

Nuclear Decay Lab

Postlab Questions



(1)  If a certain element has a half life of 3 days, how much would be

left after 15 days, if you started with 4.5g ?





















(2) For the same element what would the rate constant K be ?























(3) What is X in the following reactions ?


      226                   222

           Ra  --->            Rn   +    X

      88                      86



     210                   210

           Pb  --->            Bi   +    X

      82                      83



      88                     87

           Br  --->            Br   +    X

      35                     35