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All elements comprising the period 7 in the periodic table are radioactive. In total this period has 32 elements.
You can just put something in the sentence that is going to be radioactive that's all.
Stars seem to be, but they don't have big and/or unstable atoms such as most radioactive elements have. They release sub atomic units when their atoms fuse, along with rays such as gamma rays, which is why they can seem to be similar to other radioactive things. Some planets with atmostpheres that are ionised by ionising rays can also be similar to radioactive things perhaps.
all atoms with an atomic number under 40
it releases harmful radio active waves which s harmful to all living organism