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Question

Radioactivity is a natural disintegration of nuclei of heavy elements because only heavy elements ______

A
contain alpha particles
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B
can have unstable nuclei with neutron : proton ratio being quite uneven
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C
contain excess of neutrons
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D
can produce lead as the end product
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Solution

The correct option is D can have unstable nuclei with neutron : proton ratio being quite uneven

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.


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