Which isotope listed in the choices below is most likely to be radioactive? Ca-40
Pb-207
Pu-241
Mg-24

What do you need with it’s not a question your just stating what it says

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

Answer(false);

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.