An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?
some shielding required
no mass
large mass
high penetrating power

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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