Chemistry

Osborne

2 February, 22:14

5.0 mg of radioactive nobelium-253 was removed from the reactor to be

used in an experiment. It took 291 seconds (just under 5 minutes) to

get the sample from the reactor to the laboratory. How many milligrams

of nobelium-253 remained upon arrival to the laboratory? The half-life

of nobelium-253 is 97 seconds.