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The half-life of Na-24 is 15 hours. When there are 1,000 atoms of Na-24 in a sample, a scientist starts a stopwatch. The scientist stops the stopwatch at 45 hours; there are ______ atoms of Na-24 remaining. This is an example problem to the section. I just am unsure of the process. Thanks in advance

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What is missing in the following nuclear equation? A. alpha particle B. beta particle C. gamma particle D. proton

Which of the following can you conclude about a particle labeled ? Check all that apply. A. It has one electron. B. It has one proton. C. It is a beta particle. D. It has one neutron. E. It has one nucleon. F. It is an alpha particle. G. It has no neutrons.

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The half-life of gold-198 is 2.7 days. After _______ days, 1/4 of the original amount of gold-198 will remain.