Record number on chart. Replace "decayed atoms" with paper ... What do the curves suggest about the rate of radioactive decay in general? Groups can challenge each other to determine the "age ...

Radioactive decay is a spontaneous and random process. A block of radioactive material will contain many trillions of nuclei and not all nuclei are likely to decay at the same time so it is ...

^{4}\textrm{He}\) When a radioactive atom emits an alpha particle the mass number decreases by four and the atomic number drops by two. Here is the equation for the alpha decay of radon-219 into ...