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b. A student has an 80 g sample of a radioactive material that has a half-life of 20
seconds. How much material will he have left after one minute?
c. Given the periodic table below, write a beta decay equation for the
transmutation of a radioactive isotope of Rutherfordium, which has 104 protons
and 183 neutrons.
Periodic Table of Eleme tra esde noa
1 2
3 4 5 7 9
10
11
12 13 14 15 16 17
18
1H
Symbol
Sold
Nonmetals
Metals

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