which elements are radioactive? 1. most nonmetals 2. most metalloids 3. all actinides 4. all lanthanides

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.

answer7,570,82356 cubic centimeters;

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.