Radioactivity is a natural disintegration of nuclei of heavy elements because only heavy elements ______
Radioactivity is a natural disintegration of nuclei of heavy elements because only heavy elements can have unstable nuclei with neutron : proton ratio being quite uneven.
It is because of the instability of their atoms. Their atoms or more specifically their nucleus are very unstable because of large number of protons and neutrons. ... Radioactivity starts after Bi(83) and the elements after it have a bad ratio of proton and neutron. Basically the element which has same no.
The neutron–proton ratio (N/Z ratio or nuclear ratio) of an atomic nucleus is the ratio of its number of neutrons to its number of protons. Among stable nuclei and naturally occurring nuclei, this ratio generally increases with increasing atomic number.